“tscc.dll” error messages you may see
A program may stop with one of these messages:
- “The program can’t start because tscc.dll is missing from your computer.”
- “This application failed to start because tscc.dll was not found.”
- “Error loading tscc.dll. The specified module could not be found.”
- “A required component is missing: tscc.dll. Please install the application again.”
- “The file tscc.dll is missing or corrupted.”
- “The procedure entry point could not be located in tscc.dll.”
- “tscc.dll is not designed to run on Windows” or “contains an invalid image.”
The error may name tscc.dll, but the actual problem can also be a missing dependency, an incompatible copy, or a damaged legacy administration tool.
The 60-second answer
tscc.dll is a genuine Microsoft Windows library named Terminal Services Connection Configuration. It belongs to older Terminal Services tooling, especially the Windows XP and Windows Server 2003 era, and is associated with the tscc.msc Terminal Services Configuration console.
It is not a modern Visual C++ runtime, DirectX file, .NET Framework component, or normal Windows 10 or Windows 11 dependency. If a current computer asks for it, an old management console or legacy application is usually making the request.
Do not download tscc.dll from a random DLL website. There is no verified standalone Microsoft tscc.dll redistributable. The safe repair is to identify the program requesting the file, then repair or reinstall that program or its matching legacy Windows administration component.
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What tscc.dll does
tscc.dll means Terminal Services Connection Configuration. Older Windows Server installations used it alongside Terminal Services tools such as:
tscc.msc, the Terminal Services Configuration MMC snap-intermsrv.exe, the Terminal Services servicetsadmin.exe, the Terminal Server Administration tool
Microsoft’s legacy Remote Desktop troubleshooting documentation still refers to tscc.msc when configuring RDP-TCP connections on older Windows Server systems. See Microsoft’s guidance for troubleshooting Remote Desktop session problems.
The important distinction is that the DLL is part of a larger component. Restoring only tscc.dll may not restore the MMC snap-in, registry entries, supporting executables, or dependent files.
A file named tscc.dll can also be copied into an application’s own folder by an old program. That does not prove the application supplied the original file. The original Windows component may still be the correct source.
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The name and description are legitimate Microsoft identifiers. A genuine copy should normally be associated with Microsoft Windows and should have a valid Microsoft digital signature.
That does not mean every file named tscc.dll is safe. Malware can use a familiar filename, and an unsigned or incorrectly located copy may have been downloaded, replaced, or copied from another system.
Check the file before restoring or allowing it:
- Open File Explorer.
- Search for
tscc.dll. - Right-click each result and select Properties.
- Open the Digital Signatures tab, if present.
- Select the signature and choose Details.
- Confirm that Windows reports the signature as valid and that the signer is Microsoft.
- Open the General and Details tabs and note the full path, description, and file information.
Treat these locations carefully:
- A matching Windows system directory may be expected on an older installation.
- A program directory may be correct if the application installed its own supporting files.
- A temporary folder, Downloads folder, email attachment directory, or unknown location requires further investigation.
Do not restore a quarantined file solely because a program requests it. First confirm its origin and signature, then scan the system.
Which Windows versions used it
tscc.dll is primarily associated with older Windows releases and Windows Server editions, particularly Windows XP and Windows Server 2003-era Terminal Services installations. It is not something you should expect to find as a normal core dependency on a clean current Windows 10 or Windows 11 installation.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchA current Windows computer can still request the file when it runs:
- An old Terminal Services administration console
- A legacy Remote Desktop management package
- An application designed for Windows Server 2003-era systems
- A copied or migrated program that expects older Windows components
- A 32-bit administration utility with bundled legacy dependencies
If the error appears on Windows 10 or Windows 11, do not assume that Windows Update should simply download the file. First identify the old application or administration package requesting it.
Start by identifying what is requesting the file
Before changing system files, answer these questions:
- Does the error appear when Windows starts, or only when one program opens?
- Is the affected machine an old Windows Server, an administrator’s workstation, or a current PC running legacy software?
- Is
tscc.mscalso missing? - Did the issue begin after antivirus quarantine, Windows repair, disk cleanup, migration, or manual deletion?
- Is the application 32-bit?
- Is the error referring to
tscc.dll, or to a similar name such astsccvid.dll,tscfgwmi.dll, ortsappcmp.dll? - Does the message say “module could not be found” rather than specifically “tscc.dll is missing”?
If only one application reports the problem, repair that application first. If tscc.msc and other Terminal Services tools are missing too, repair the matching Windows or administration-tools component instead.
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A useful first check is to right-click the application shortcut, select Properties, and inspect the Target field. Note the program folder. Then search that folder and its subfolders for tscc.dll. A copy beside the application may indicate that the program expects a private legacy installation rather than a Windows system file.
Fix 1: Check Microsoft Defender quarantine
Antivirus quarantine is a common reason an application suddenly loses a DLL. The detection may also indicate that the file was maliciously replaced, so review it rather than blindly restoring it.
- Open Start.
- Type Windows Security and open it.
- Select Virus & threat protection.
- Select Protection history.
- Expand recent detections.
- Inspect the detected file path, threat name, date, and action.
- If the file is clearly from a trusted matching Windows installation and its signature is valid, follow Microsoft’s restore instructions.
- If the file is in a temporary or unknown folder, leave it quarantined.
- Run Scan options and perform at least a Full scan.
- Restart the computer and test the affected program.
Microsoft explains quarantine and restoration in its Windows Security Protection History documentation.
If Defender repeatedly removes the file, do not create an exclusion just to make the application start. Investigate the file’s source and scan the entire application directory.
Fix 2: Repair or reinstall the application that reports the error
If only one legacy program displays the message, this is usually the safest first repair.
For a traditional desktop application
- Close the affected program.
- Open Settings.
- Select Apps.
- Select Installed apps.
- Find the application.
- Select the three-dot menu beside it.
- Choose Advanced options, if available.
- Select Repair.
- If Repair is unavailable or does not help, choose Uninstall.
- Restart Windows.
- Reinstall the application from its original installer or the organization’s trusted software repository.
- Test the program before copying any DLL manually.
For older software, the repair option may not exist. Use Control Panel instead:
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- Press
Win+R. - Enter
appwiz.cpl. - Press Enter.
- Select the affected program.
- Choose Change, Repair, or Uninstall, depending on what the installer provides.
- Restart after the repair or reinstall.
If the program is an old Terminal Services administration package, reinstall the complete package rather than placing one DLL into System32. The package may also need tscc.msc, MMC registration, supporting executables, and matching architecture files.
If reinstalling the specific application is the only repair that works, keep that solution. tscc.dll belongs to a legacy component relationship, not a general-purpose runtime package.
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On an older Windows Server system, determine the exact Windows edition and service-pack level before repairing anything. Use installation media or an administration-tools package that matches the installed release.
Do not copy a file from a different Windows release. A file from one Server version may have different dependencies, exports, architecture, or registration requirements.
The correct procedure is:
- Locate matching Windows installation media or the original administration-tools installer.
- Confirm that the media matches the installed edition and service-pack level.
- Start the installer or component setup.
- Choose the repair or component installation option.
- Select the Terminal Services or Remote Administration component if the installer exposes it.
- Complete setup.
- Restart the server.
- Press
Win+R, entertscc.msc, and press Enter. - Confirm that the Terminal Services Configuration console opens.
If tscc.msc is still missing, the repair has not restored the complete administration component. Do not treat a copied DLL as an equivalent replacement.
On a current Windows 10 or Windows 11 system, optional Windows Features are unlikely to recreate this old Terminal Services console. You can still check available features:
- Open Start and search for Turn Windows features on or off.
- Open the result.
- Review the available Remote Desktop, administration, or management features.
- Select only a feature that is clearly required by the application and supported by the installed Windows edition.
- Select OK.
- Restart if Windows requests it.
Do not enable unrelated features merely because their names include Remote Desktop. Modern Remote Desktop features do not automatically provide the old tscc.dll component.
Fix 4: Run DISM and System File Checker
Use these commands when the file may be part of the active Windows image or when other protected Windows files are also damaged. They are less likely to restore an optional legacy administration tool that is not installed in the current image.
- Open Start.
- Type Command Prompt.
- Right-click Command Prompt.
- Select Run as administrator.
- Approve the User Account Control prompt.
- Run:
DISM.exe /Online /Cleanup-Image /RestoreHealth
- Wait for the command to finish.
- Then run:
sfc /scannow
- Wait until verification reaches 100 percent.
- Restart Windows.
- Test the application again.
Microsoft recommends using DISM before SFC because DISM repairs the component source that SFC uses. Follow Microsoft’s System File Checker and DISM procedure.
Success means SFC reports that it found and repaired corrupted files, or that no integrity violations were found, and the application starts normally afterward. If SFC reports that it could not repair some files, run DISM again after confirming that the computer has access to Windows Update, then repeat SFC.
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When repeatedly hunting through component versions and rerunning SFC or DISM does not show what changed, Outbyte PC Repair can scan for the underlying Windows issues and identify what needs repair; the free scan shows the findings, while repair requires the full version. It is optional, and reinstalling the specific legacy application remains the definitive fix when that application owns the missing component.
Fix 5: Use System Restore after a recent change
System Restore is appropriate when tscc.dll worked recently and the problem began after a cleanup operation, software installation, update, or repair.
- Press
Win+R. - Enter:
rstrui.exe
- Press Enter.
- Select Next.
- Choose a restore point from before the error began.
- Select Scan for affected programs if available.
- Review the programs and drivers that may be removed or restored.
- Select Next.
- Select Finish.
- Allow Windows to restart and complete the restore.
Microsoft describes this process in its System Restore documentation.
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System Restore rolls back system files, registry settings, and installed programs while preserving personal files. It cannot help if System Protection was disabled or no suitable restore point exists. If it completes but the error remains, return to repairing the owning application or component.
Fix 6: Check architecture and file location
Legacy software is often 32-bit, even when it runs on 64-bit Windows. A 32-bit application may require 32-bit supporting files. On 64-bit Windows, SysWOW64 contains 32-bit system binaries, while System32 contains 64-bit system binaries.
Do not use those folder names as a copying guide. The correct destination depends on the package that installed the file.
To identify the affected program’s architecture:
- Open Task Manager with
Ctrl+Shift+Esc. - Select Details.
- Right-click a column heading.
- Select Select columns.
- Enable Platform, if available.
- Check whether the program is 32-bit or 64-bit.
You can also inspect the application’s installer documentation or ask the software vendor. Do not place a 32-bit Server-era DLL into an arbitrary 64-bit system folder.
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An architecture mismatch can produce:
- “The procedure entry point could not be located”
- “The application was unable to start correctly”
- “The file is not designed to run on Windows”
- Invalid-image errors
These messages generally require the correct package and version, not another copy of the same filename.
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Fix 7: Update or reinstall related drivers only when evidence points there
A display, network, or virtual-session driver is not the normal source of tscc.dll. Update drivers only if the affected legacy application depends on a device or virtual adapter and the problem began after a driver change.
Use Device Manager carefully:
- Right-click Start.
- Select Device Manager.
- Expand the relevant category, such as Network adapters, Display adapters, or System devices.
- Right-click the affected device.
- Select Properties.
- Open the Driver tab.
- Note the provider, date, and version.
- Select Update Driver.
- Choose Search automatically for drivers.
- Restart Windows if a driver is installed.
If the problem began immediately after a driver update, open the same Driver tab and select Roll Back Driver, if available. Otherwise, download the driver only from the computer or hardware manufacturer’s official support channel.
When several legacy devices make it difficult to determine which driver is stale, Outbyte Driver Updater can scan and identify driver issues; the free scan shows what it finds, while driver installation requires the full version. It is optional, and a driver change should not replace repairing the application that actually requests tscc.dll.
Do not use regsvr32 as a routine fix
regsvr32 is for DLLs that provide a registration entry point such as DllRegisterServer. Microsoft documents its use for registering compatible ActiveX controls and other self-registering DLLs in the regsvr32 command documentation.
There is no authoritative Microsoft instruction showing that tscc.dll should be registered with:
regsvr32 tscc.dll
Running that command will not repair a missing dependency, wrong architecture, damaged component, or absent tscc.msc. If the file does not export the required registration function, the command will fail.
Use regsvr32 only when the software’s official documentation specifically requires it and identifies the correct DLL and architecture. It is not a general DLL repair command.
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Why manual DLL copying is risky
Downloading or copying a single DLL can leave the real problem untouched. It may also introduce a worse one:
- The file may contain malware.
- The version may belong to another Windows release.
- The architecture may be wrong.
- Dependencies may still be missing.
- The application may also need
tscc.mscand other files. - The file may be placed in the wrong search path.
- A copied file may fail signature validation.
- The error may actually concern a similarly named DLL.
A manual copy is reasonable only in a controlled administrative recovery when the file comes from identical installation media or a verified matching computer, and the administrator has confirmed its architecture, version, signature, and destination. Even then, reinstalling the owning component is preferable.
The safe sources are:
- Matching Windows installation media
- The original Microsoft administration-tools package
- The original application installer
- An organization’s trusted software repository
- Windows component repair mechanisms
There is no current official Microsoft standalone download page for tscc.dll.
If the problem persists
Use this checklist before escalating:
- Confirm the exact filename in the error.
- Check whether the error names
tscc.dllor another similarly named file. - Identify the executable that launches when the message appears.
- Check whether the application is 32-bit.
- Record the full path Windows is searching.
- Inspect any existing copy for a valid Microsoft signature.
- Review Windows Security Protection History.
- Repair or reinstall the specific application.
- Run DISM and SFC when the active Windows image may be damaged.
- Try System Restore if the timing matches a recent system change.
- Test
tscc.mscseparately if the issue concerns Terminal Services administration. - Review the application’s event logs or vendor documentation for missing dependencies.
If the program runs only on Windows XP or Windows Server 2003, isolate it from the internet and plan a migration. Those platforms are obsolete and unsupported. A successful DLL repair does not make an old server safe for internet-facing use.
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Is tscc.dll a Windows 11 file
It is a legacy Microsoft Windows component associated with older Terminal Services tooling. Do not assume a clean Windows 11 installation should contain it. On Windows 11, identify the old application or administration package requesting it.
Is tscc.dll malware
The legitimate file is a Microsoft Terminal Services library, but any file with that name can be malicious or corrupted. Check its path, digital signature, and Defender scan results before restoring it.
Can I download tscc.dll separately
There is no verified standalone Microsoft redistributable for it. Use matching installation media or reinstall the application or administration component that supplied it.
Will installing Visual C++, DirectX, or .NET fix the error
There is no evidence that tscc.dll is part of those runtimes. Install them only when the affected application separately documents that requirement.
Should I copy tscc.dll into System32
No. The correct location depends on the owning component and architecture. Copying it into System32 or SysWOW64 can create an incompatible installation and will not restore related files.
Should I register it with regsvr32
Not routinely. regsvr32 applies to DLLs that expose the required registration entry point, and there is no authoritative instruction that tscc.dll needs registration.
What if SFC says everything is fine
The file may belong to an optional legacy administration tool or the affected application rather than the active Windows image. Repair or reinstall that specific package.
What if tscc.msc is missing too
That points to a missing or incomplete Terminal Services administration component. Restore the complete matching package instead of copying only tscc.dll.
Why does “module could not be found” appear when the file exists
Windows may be unable to load one of tscc.dll’s dependencies. The message does not always mean that the named file itself is absent. Repair the complete component and verify architecture compatibility.
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