installutillib.dll Not Found: Fix .NET and MSI Errors on Windows

If installutillib.dll is missing, Windows or an application is usually failing to load part of the Microsoft .NET Framework. Because installutillib.dll is used by .NET installation tools and managed installer actions, the correct repair is normally a .NET Framework repair, an application reinstall, or an MSI troubleshooting step rather than copying a DLL from the internet.

Start with this quick diagnosis

Before changing Windows components, note:

• Which program, game, service installer, or uninstaller displays the message.
• Whether the message appears while launching an application or during installation and removal.
• The exact wording, especially Error 1001, CorBindToRuntimeHost, 0x80131700, or 0x80070003.
• Whether the failure began after an application update, Windows update, antivirus alert, or driver installation.
• Whether Windows is 32-bit or 64-bit and whether the failing application is 32-bit or 64-bit.
• Whether another application using .NET works normally.

This context matters because a missing-file message at application launch points toward the application or its prerequisites. Error 1001. InstallUtilLib.dll: Unknown error usually points toward a Windows Installer custom action, a .NET runtime-binding failure, an architecture mismatch, or a defective installer package.

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What is installutillib.dll?

InstallUtilLib.dll is a Microsoft .NET Framework component. Its metadata may show the internal name InstallUtilLib.lib, and its normal job is to support .NET installer tooling and managed installer-class custom actions.

Microsoft documents InstallUtil.exe as a tool that executes installer components in .NET assemblies. Installers use this infrastructure for tasks such as registering services, configuring managed components, and completing other setup or removal actions. You do not normally launch InstallUtilLib.dll yourself.

The file is associated with:

• MSI installation and removal.
• Windows service installers.
• .NET custom actions.
• Some COM-registration steps performed by managed installers.
• Older applications targeting .NET Framework 2.0 through 3.5.
• Damaged, incomplete, or incorrectly serviced .NET Framework installations.

It is not a Visual C++ Redistributable file, DirectX runtime file, graphics-driver component, or ordinary game-runtime DLL.

.NET Framework is a Windows desktop framework from Microsoft. Current Windows releases include parts of .NET Framework, but older compatibility components such as .NET Framework 3.5 may need to be enabled or installed separately. Microsoft’s .NET Framework installation guide explains how the framework relates to supported Windows versions.

The safest first fix

The safest initial repair depends on when the error appears.

If the error appears while starting one application, repair or reinstall that application first. The application may have an incomplete private installation, a damaged prerequisite, or an installer-created service that was not registered correctly.

If the error appears during an MSI installation or uninstall, repair the required .NET Framework version and then rerun the original installer. Do not begin by copying installutillib.dll into System32, SysWOW64, or the application folder.

Use this order:

1. Restart Windows.
2. Repair the affected application.
3. Repair or install the required .NET Framework generation.
4. Enable .NET Framework 3.5 if the program is legacy software.
5. Repair Windows components with DISM and SFC.
6. Check antivirus quarantine.
7. Generate an MSI log if Error 1001 continues.
8. Contact the software vendor if the MSI custom action is defective.

Fix 1: Repair or reinstall the affected application

When only one program fails, the application is the most useful place to start. A system-wide .NET repair cannot correct a broken application-specific custom action, missing service registration, bad configuration file, or damaged private files.

Repair a Windows application

On Windows 11:

1. Open Start.
2. Select Settings.
3. Select Apps.
4. Select Installed apps.
5. Find the affected application.
6. Select the three-dot menu beside it.
7. Choose Advanced options.
8. Select Repair.
9. Start the application again.

The Repair option preserves the application’s data when supported. If it is missing or does not solve the problem, return to the same screen and select Reset only if you understand that the application may lose local settings or cached data.

Microsoft documents this process in its guide to repairing apps and programs in Windows.

Repair a classic desktop application

For a traditional MSI-installed program:

1. Press Win+R.
2. Enter appwiz.cpl.
3. Press Enter.
4. Select the affected application.
5. Choose Repair, Change, or Modify if available.
6. Follow the installer prompts.
7. Restart Windows.
8. Test the application again.

If the application has no repair option, uninstall it from the same window, restart Windows, and install it again using the original vendor package. Use a local folder such as C:\Installers\AppName rather than launching the installer from a network share, temporary archive, or removable drive.

For a game, use the launcher’s Verify, Repair, or Verify integrity function when available. This is appropriate when the launcher installed the affected files. It does not make downloading an isolated DLL safe.

How to tell whether this worked

The repair succeeded if:

• The application starts without the missing-file message.
• The installer completes without rolling back.
• A service or managed component is registered correctly.
• Uninstalling the application no longer produces InstallUtilLib.dll errors.

If the same program still produces Error 1001, continue with the .NET Framework checks below. The installer may be calling the wrong runtime, using the wrong architecture, or containing a broken custom action.

Fix 2: Install or repair the required .NET Framework version

installutillib.dll belongs to .NET Framework, not modern .NET 5, .NET 6, .NET 7, .NET 8, or later. Installing the current modern .NET runtime does not automatically repair an application built for .NET Framework.

There are two broad framework families to distinguish:

• .NET Framework 3.5, which provides compatibility for applications targeting older .NET Framework generations.
• .NET Framework 4.x, including 4.8 and 4.8.1, which supports applications targeting the newer .NET Framework line.

A program requiring .NET Framework 3.5 may continue to fail even when .NET Framework 4.8.1 is installed. Microsoft describes .NET Framework 3.5 as the compatibility framework for applications targeting versions 1.0 through 3.5 in its installation guide.

Check the installed .NET Framework 4.x release

Open Command Prompt as administrator:

1. Open Start.
2. Type cmd.
3. Right-click Command Prompt.
4. Select Run as administrator.
5. Enter:

reg query "HKLM\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full" /v Release

1. Press Enter.

If the command returns a Release value, a .NET Framework 4.x installation is present. The exact value identifies the installed release, but the application may still require repair or a different framework generation.

Microsoft’s version-detection guide explains how to interpret installed .NET Framework versions.

Install or repair .NET Framework 4.8.1

For applications that specifically require .NET Framework 4.8.1:

1. Open Microsoft’s Download .NET Framework 4.8.1 page.
2. Choose the Runtime, not the Developer Pack.
3. Download the installer.
4. Close running applications.
5. Right-click the downloaded installer.
6. Select Run as administrator.
7. Accept the license terms.
8. Allow setup to complete.
9. Restart Windows.
10. Run the original application or MSI installer again.

The Developer Pack is intended for software development. Ordinary users trying to run an application generally need the Runtime.

Install or repair .NET Framework 4.8

If the application documentation names .NET Framework 4.8 rather than 4.8.1, use Microsoft’s official .NET Framework 4.8 download page.

The installer may report that a newer compatible version is already installed. That does not prove that every framework file is healthy. If setup refuses to continue and the application still fails, use Microsoft’s Repair Tool and Windows component repair steps later in this guide.

Run the .NET Framework Repair Tool

Microsoft provides the .NET Framework Repair Tool for supported .NET Framework installations. The tool supports .NET Framework 3.5 SP1 and versions through 4.8 according to Microsoft’s documentation. Do not assume it repairs every 4.8.1-specific problem.

To use it:

1. Download the tool from Microsoft.
2. Save it to a local folder.
3. Right-click the downloaded file.
4. Select Run as administrator.
5. Accept the license terms.
6. Allow the diagnostic checks to run.
7. Apply the recommended repair.
8. Restart Windows.
9. Retry the application or MSI.

The tool can correct common setup, registration, and configuration problems. If it reports that no repair was made, continue with the application repair and DISM/SFC procedures rather than repeatedly running the same tool.

How to tell whether the .NET repair worked

Test the original action that failed:

• Start the application if the error appeared at launch.
• Run the MSI if the error appeared during installation.
• Run the uninstaller if removal was failing.
• Start the Windows service if service registration was involved.

If the error changes from CorBindToRuntimeHost to another message, the runtime may now be loading and the remaining problem may be inside the application’s custom action.

Fix 3: Enable .NET Framework 3.5 for older programs

Many older games, tools, control panels, utilities, and business applications target .NET Framework 2.0, 3.0, or 3.5. Installing .NET Framework 4.x alone does not satisfy every application built for that earlier framework family.

Enable .NET Framework 3.5 through Windows Features

On Windows 11 25H2 and earlier, use these steps:

1. Open Start.
2. Search for Turn Windows features on or off.
3. Open it.
4. Select the checkbox beside .NET Framework 3.5 (includes .NET 2.0 and 3.0).
5. Select OK.
6. Allow Windows to download or install the required files.
7. Restart Windows.
8. Run the original application or installer again.

If Windows cannot download the feature, the computer may be offline, Windows Update may be unavailable, or the component store may be damaged.

You can check the feature state from an elevated Command Prompt:

dism /online /get-featureinfo /featurename:NetFx3

Look for the feature state in the output. If it is disabled, enable it with Windows Features or a matching installation source.

Use matching Windows installation media

If Windows Features cannot obtain the files and you have installation media matching the installed Windows release:

1. Mount the Windows ISO or connect the installation media.
2. Note its drive letter.
3. Open Command Prompt as administrator.
4. Run the command below, replacing D: with the actual media drive:

DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs

The source must match the same Windows release. Using mismatched installation media can create an unsupported servicing state or fail during installation.

Restart Windows after the command completes and test the application again.

Windows 11 26H1 and later

Windows 11 26H1 changes how .NET Framework 3.5 is supplied. On those releases, .NET Framework 3.5 is provided through a standalone, version-specific installer rather than the older Windows optional-component process.

Use Microsoft’s Windows 11 .NET Framework 3.5 installation instructions for the installed Windows release. Do not reuse an older 3.5 installer simply because it worked on a previous Windows build.

Fix 4: Repair Windows component files with DISM and SFC

Use DISM and System File Checker when:

• SFC specifically identifies InstallUtilLib.dll.
• Several Windows components are failing.
• Windows Update or optional features also fail.
• The .NET Framework installer reports damaged system components.
• The problem began after a failed update or interrupted installation.

These commands repair Windows itself. They are less likely to fix a single defective application MSI.

Run DISM first

1. Open Start.
2. Type Terminal.
3. Right-click Windows Terminal.
4. Select Run as administrator.
5. Enter:

DISM.exe /Online /Cleanup-Image /RestoreHealth

1. Press Enter.
2. Wait for the scan and repair to finish.

DISM may take time and can appear to pause at a percentage. Do not close the window while it is working.

When it completes, note the result:

• A successful repair means the component store was repaired or no corruption was found.
• An error about source files means Windows could not obtain suitable repair files.
• An access or servicing error may indicate pending updates, policy restrictions, or a damaged servicing environment.

Microsoft recommends running DISM before SFC in its Windows repair guidance.

Run System File Checker second

In the same elevated Terminal window, run:

sfc /scannow

Wait until verification reaches 100 percent.

Possible results include:

• Windows Resource Protection did not find any integrity violations: protected system files appear intact.
• Windows Resource Protection found corrupt files and successfully repaired them: restart Windows and test again.
• Windows Resource Protection found corrupt files but was unable to fix some of them: review the CBS log and repeat the repair process only after addressing the DISM result.

Restart Windows after SFC completes.

To check whether SFC specifically mentioned the file, search the CBS log with PowerShell:

Select-String -Path "$env:windir\Logs\CBS\CBS.log" -Pattern "InstallUtilLib.dll"

A reference to an x86_netfx-installutillib_dll component indicates that SFC encountered a .NET Framework component, but it does not by itself identify which application caused the failure.

Repeatedly running SFC and DISM without knowing what changed can turn troubleshooting into guesswork; Outbyte PC Repair offers a free scan that shows what it finds, while the repair is done by its full version. It is optional, and a broken application installer still needs repair or replacement from the application’s vendor.

Fix 5: Check the file’s normal location and architecture

The file is normally associated with versioned .NET Framework directories such as:

%WINDIR%\Microsoft.NET\Framework\v2.0.50727\
%WINDIR%\Microsoft.NET\Framework\v4.0.30319\
%WINDIR%\Microsoft.NET\Framework64\v2.0.50727\
%WINDIR%\Microsoft.NET\Framework64\v4.0.30319\

Windows also maintains .NET Framework components in the component store under WinSxS. That does not mean every installation has the file at one universal WinSxS path.

To search the normal .NET Framework directories without changing anything:

1. Open Start.
2. Search for PowerShell.
3. Open it.
4. Run:

Get-ChildItem "$env:windir\Microsoft.NET" -Filter InstallUtilLib.dll -Recurse -ErrorAction SilentlyContinue |
  Select-Object FullName, Length, @{Name="Version"; Expression={$_.VersionInfo.FileVersion}}

This lists matching copies, their paths, their sizes, and their file versions where Windows exposes that metadata.

Do not use a file’s size alone to decide whether it is correct. Microsoft’s update tables show that InstallUtilLib.dll has different servicing versions and different sizes for x86 and x64 copies. There is no single universal file size that applies to every Windows installation.

Why x86 and x64 matter

A 64-bit Windows installation can contain both:

• x86 .NET Framework components for 32-bit applications.
• x64 .NET Framework components for 64-bit applications.

The Framework directory is generally associated with 32-bit components, while Framework64 is associated with 64-bit components. The correct copy is determined by the process loading it, not simply by the bitness of Windows.

For example, a 32-bit service installer running on 64-bit Windows needs the x86 framework environment. A 64-bit custom action needs the x64 environment. If an MSI embeds or calls the wrong architecture, reinstalling the newest framework may not solve the problem.

Do not copy a file from Framework64 into Framework, or the other way around. Do not place either copy beside an executable to force it to load.

Fix 6: Check Windows Security Protection History

Antivirus or endpoint security software can quarantine a framework file, although an alert is not proof that the file was malicious. A failed installation immediately after a security detection is a reason to inspect the event.

To check Windows Security:

1. Open Start.
2. Search for Windows Security.
3. Open it.
4. Select Virus & threat protection.
5. Select Protection history.
6. Review recent detections.
7. Expand any event related to the affected application, .NET Framework, or installer.

If the file came from an official Microsoft or trusted application installer, confirm the detection carefully before taking action. If it came from a random DLL download site, do not restore it.

The safer response is:

1. Note the detection name and affected path.
2. Remove or leave quarantined files from untrusted sources.
3. Download the official .NET Framework package or application installer again.
4. Run a full security scan.
5. Reinstall the affected component from the trusted package.

Microsoft explains Protection History in its Windows Security documentation.

Fix 7: Use an MSI log for Error 1001

If the visible message is:

Error 1001. InstallUtilLib.dll: Unknown error.

the filename is only part of the diagnosis. The MSI may be failing while loading a managed custom action, binding to a .NET runtime, registering a service, accessing a path, or cleaning up an existing installation.

Run the MSI with verbose logging:

1. Create a local folder such as C:\MsiLogs.
2. Copy the original .msi file to a local folder if necessary.
3. Open Command Prompt as administrator.
4. Run:

msiexec.exe /i "C:\Path\setup.msi" /L*V "C:\MsiLogs\package.log"

Replace the MSI and log paths with the actual paths. The destination directory must already exist.

For an uninstall, use the appropriate product code or launch the application’s uninstall MSI with logging. Do not guess a product code from a random source.

Open the resulting log in Notepad and search for:

• InstallUtilLib
• CorBindToRuntimeHost
• Return Value 3
• 1603
• 2769
• CustomAction
• The name of the service being installed
• The application’s own product or component name

The most useful area is usually immediately before Return Value 3. That section often identifies the custom action that actually failed.

Microsoft documents the logging options in its msiexec command-line reference and provides additional Windows Installer troubleshooting guidance.

Interpreting CorBindToRuntimeHost

This message is especially useful:

Error 1001. InstallUtilLib.dll: CorBindToRuntimeHost (hr=0x80131700): ...

CorBindToRuntimeHost refers to the step where the installer tries to load or bind to the required .NET runtime. The 0x80131700 form usually means the required runtime could not be loaded or bound successfully.

Likely causes include:

• The required .NET Framework version is missing.
• The framework installation is damaged.
• The MSI targets .NET Framework 3.5 but only 4.x is enabled.
• The custom action is x86 while the package expects x64, or the reverse.
• A framework update is incomplete.
• The installer is using an invalid runtime configuration.

Another form is:

Error 1001. InstallUtilLib.dll: CorBindToRuntimeHost (hr=0x80070003): The specified path could not be found.

0x80070003 points more toward a missing path, inaccessible location, or incorrectly configured custom action. Check the MSI log for the path involved rather than replacing the DLL.

Interpreting Error 2769 and 1603

A log may also contain:

DEBUG: Error 2769: Custom Action ... did not close 1 MSIHANDLEs.

or:

CustomAction ... returned actual error code 1603

These entries do not prove that installutillib.dll is missing. They can be secondary cleanup messages after an earlier custom action failed.

Look upward in the log for the first meaningful failure. Check:

• The exact custom action name.
• Its return code.
• The account running the installer.
• The target service or COM registration.
• Any path, permission, or architecture error.
• Whether the application is already partially installed.

If the log shows a bad or incorrectly packaged custom action while the required .NET Framework is present, the installer vendor needs to rebuild or replace the MSI.

Fix 8: Use System Restore after a recent system change

System Restore is appropriate when the problem began immediately after:

• A Windows update.
• A framework update.
• An application installation.
• A driver or security-software change.
• A configuration change that affected several programs.

It is not the first choice for a single broken application with a current installer available.

To open System Restore:

1. Press Win+R.
2. Enter:

rstrui.exe

1. Press Enter.
2. Select Next.
3. Choose a restore point created before the problem began.
4. Select Scan for affected programs if available.
5. Review the changes.
6. Start the restore.

You can also open Control Panel, select Recovery, and choose Open System Restore.

System Restore rolls back system files, registry settings, and installed programs, while normally leaving personal files untouched. Microsoft describes the feature in its System Restore documentation.

After the rollback, test the original program. If the issue returns after Windows Update or a particular installer runs again, the MSI or update package may be the real cause.

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Fix 9: Update drivers only when a driver installer is failing

A driver reinstall is not a general fix for installutillib.dll. The file belongs to .NET Framework, so reinstalling a graphics, chipset, audio, or network driver merely because the DLL name appeared in an error is unlikely to help.

Driver troubleshooting is relevant when:

• The error appears only while installing a specific hardware vendor package.
• The MSI log names a driver installer custom action.
• The failure began with a particular device package.
• The vendor has released a corrected package.
• Device Manager shows a related device error.

Check Device Manager

1. Right-click Start.
2. Select Device Manager.
3. Expand the category for the affected device.
4. Right-click the device.
5. Select Properties.
6. Check the General tab for a device status message.
7. Open the Driver tab.
8. Note the provider, date, and version.
9. Use Update Driver only when you have a trusted package or Windows can locate a suitable driver.
10. Restart Windows and rerun the vendor installer.

For a clean repair, obtain the driver package from the hardware manufacturer’s official support page. If the vendor installer itself is defective, a newer driver may still produce the same Error 1001 until the package is corrected.

Manually identifying the right vendor package across several hardware devices can be tedious; Outbyte Driver Updater offers a free scan that shows which drivers are stale, while driver installation is handled by its full version. It is optional, and a broken hardware vendor MSI still requires a corrected package from that vendor.

Do not use regsvr32 for this file

Do not run:

regsvr32 installutillib.dll

regsvr32 is used for DLLs that expose COM self-registration entry points such as DllRegisterServer. A normal DLL may load successfully with regsvr32 but still fail because it does not implement the required registration function.

InstallUtilLib.dll is a .NET installer and managed custom-action utility, not an end-user COM server that should be registered manually. Running regsvr32 will not repair a missing .NET Framework installation, fix an MSI architecture mismatch, or rebuild an application’s service registration.

If the MSI needs to register a service or managed component, let the original installer perform that action.

Why manually copying the DLL usually fails

Downloading installutillib.dll from a random DLL website and copying it into a system folder is risky and usually addresses the wrong layer of the problem.

A manually copied file can have:

• The wrong architecture.
• The wrong .NET Framework generation.
• An incompatible servicing level.
• Missing dependencies.
• Incorrect permissions.
• A damaged or tampered signature.
• No connection to the Windows component store.
• No repair to the MSI or managed custom action that actually failed.

It can also make later diagnosis harder by mixing framework files from unrelated Windows installations.

Do not copy it to:

C:\Windows\System32
C:\Windows\SysWOW64

Do not copy it beside a game executable unless the software vendor explicitly provides a complete, architecture-matched package and instructs you to do so. For ordinary Windows repair, reinstall the correct .NET Framework or application package from Microsoft or the application vendor.

Common causes and the correct response

Symptom	Most likely area	Correct response
One application will not launch	Damaged application or missing prerequisite	Repair or reinstall the application, then verify its .NET requirement
MSI displays Error 1001	Managed custom action or runtime binding	Repair the required .NET Framework and inspect an MSI verbose log
CorBindToRuntimeHost with 0x80131700	.NET runtime could not load	Install or repair the required .NET Framework generation and check x86/x64
CorBindToRuntimeHost with 0x80070003	Missing or inaccessible path	Inspect the MSI log for the path and run the installer from a local folder
Old application requires .NET 3.5	Legacy compatibility framework disabled	Enable or install .NET Framework 3.5 for the installed Windows release
SFC mentions InstallUtilLib.dll	Component-store or protected-file corruption	Run DISM first, then SFC, and restart
Error follows an antivirus detection	Quarantine or blocked installation	Review Protection History and reinstall from a trusted source
Only a driver package fails	Vendor MSI defect or driver package issue	Use the vendor’s corrected package and inspect the MSI log
Multiple unrelated DLLs fail	Broader system or security problem	Run security scans and repair Windows or restore from a known-good point

This is a troubleshooting ranking, not a claim about exact failure percentages. The filename alone cannot identify which program caused the error.

FAQ

Is installutillib.dll part of Windows?

It is a Microsoft .NET Framework component associated with Windows installation infrastructure. It is not a standalone Windows application and is not normally launched directly. Current Windows releases include .NET Framework components, but older compatibility features may need to be enabled.

Is installutillib.dll part of modern .NET?

No. It belongs to .NET Framework, particularly the Windows desktop framework used by older managed applications and installer custom actions. Installing modern .NET does not necessarily satisfy a program requiring .NET Framework 3.5 or 4.x.

Does installing .NET Framework 4.8.1 fix every installutillib.dll error?

No. It can repair applications targeting the appropriate .NET Framework 4.x generation, but it does not automatically satisfy every .NET Framework 3.5 application. It also cannot fix a broken MSI custom action, an x86/x64 mismatch, an inaccessible path, or an application-specific installation defect.

What does Error 1001 mean?

Error 1001. InstallUtilLib.dll: Unknown error is a generic installer failure. It does not prove that the DLL is absent. The failure may involve runtime binding, framework corruption, service registration, permissions, a missing path, architecture mismatch, or a defective MSI.

What does CorBindToRuntimeHost mean?

It identifies the runtime-binding stage where the installer attempts to load the required .NET Framework runtime. 0x80131700 usually points toward a runtime that cannot load or bind. 0x80070003 usually points toward a missing or inaccessible path. The MSI log provides the useful context.

Where should installutillib.dll normally be found?

It is normally associated with versioned .NET Framework directories under:

%WINDIR%\Microsoft.NET\Framework\
%WINDIR%\Microsoft.NET\Framework64\

The exact subdirectory depends on the installed framework generation and architecture. Windows also maintains framework components in the component store.

Should I copy installutillib.dll to System32?

No. Copying it to System32, SysWOW64, or an application folder can introduce the wrong architecture or servicing version and does not repair the framework installation.

Should I run regsvr32?

No. regsvr32 is intended for self-registering COM DLLs. InstallUtilLib.dll is a .NET installer utility and is not normally repaired through manual COM registration.

Why does the error happen during an MSI uninstall?

An MSI uninstall can run the same type of managed custom action used during installation. It may be trying to remove a Windows service, unregister a managed component, or run cleanup code. A broken framework binding or damaged application package can therefore produce the error during removal.

Is a driver reinstall relevant?

Only when the failing installer is specifically a hardware vendor’s driver package. The DLL itself is not a graphics, chipset, audio, or network driver file.

What if the error remains after repairing .NET?

Generate a verbose MSI log and find the first meaningful failure before Return Value 3. Confirm the application’s target framework, check x86/x64 compatibility, run the installer from a local administrator account and local folder, and verify whether the service or COM registration already exists. If the MSI embeds an incorrect custom action, the software vendor must provide a corrected package.

Can antivirus quarantine cause the message?

Yes, but it is only one possible cause. Check Windows Security > Virus & threat protection > Protection history. Restore a quarantined item only when its origin is trusted. For anything downloaded from an unofficial DLL source, leave it quarantined and reinstall from an official package.

When should I use System Restore?

Use it when the issue began immediately after a system change and normal application, .NET, and Windows repair steps did not help. It is especially useful when several programs began failing after one update or installation. It is not necessary for every isolated missing-DLL message.

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