userinfo.dll is usually an NSIS installer plug-in, not a Windows system file. If userinfo.dll is missing, cannot be loaded, or is reported as corrupt, repair the installer or application that requested it instead of copying a DLL into System32.
The strongest documented match is an NSIS-based installer, including the optional Overwolf component in some TeamSpeak 3 installation paths. The same filename is not globally unique, so identify the affected program and the full path shown in the error before changing Windows.
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Identify what userinfo.dll belongs to
| What to check | What it tells you |
|---|---|
| Application named in the error | The installer or product that should supply the file |
| Full file path | A temporary installer path is different from a permanent application folder |
| When the error appears | During setup usually indicates a damaged or blocked installer |
| File location | System32 or SysWOW64 is not the expected location for this plug-in |
| File version and size | There is no dependable universal version or size for every copy |
NSIS installers commonly extract plug-ins temporarily under a randomly named folder in %TEMP%. A development installation may instead keep the plug-in under an NSIS Plugins directory. The installer normally loads it automatically and removes temporary files after setup.
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Fix 1: Download the affected installer again
This is the safest and most likely fix when the message appears during installation.
- Cancel the setup program.
- Delete the installer you downloaded.
- Open the product developer’s official website manually.
- Download the current installer again.
- Save it to a local folder such as
Downloadsrather than running it from a browser’s temporary location. - Right-click the new installer and select Properties.
- If an Unblock checkbox appears on the General tab, select it and click Apply.
- Right-click the installer again and select Run as administrator.
- Complete the installation.
Do not use an unofficial repack, download manager, torrent, or altered installer. A partial download, damaged archive, modified installer, or missing embedded plug-in can all produce a userinfo.dll error.
TeamSpeak 3 installation
If the error appears while installing TeamSpeak 3, rerun the official installer and clear the optional Overwolf component if you do not need it. The documented TeamSpeak failure is associated with that optional installation path, while the main client may install successfully without it.
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If TeamSpeak still fails, delete the old installer, download a fresh copy from the official TeamSpeak website, and try again. Record whether the error appears before or after the installer extracts files.
A successful repair lets setup proceed without the userinfo.dll message. If the same error returns with a fresh official download, continue with the checks below rather than downloading the DLL separately.
Fix 2: Check whether antivirus removed the plug-in
Security software can quarantine an installer plug-in. Do not immediately restore the file, because a malicious installer can also contain a file with this name.
- Open Start and search for Windows Security.
- Select Virus & threat protection.
- Under Current threats, select Protection history.
- Review entries created at the time of the failed installation.
- Expand any entry associated with the installer or
userinfo.dll. - Note the detection name, file path, and action taken.
- Verify that the installer came directly from the product developer.
- If the source is trusted but the file appears to be a false positive, submit the detection to the antivirus vendor and download a fresh installer.
Microsoft’s guidance on Protection History explains how quarantined items and allowed threats are handled.
Do these 3 things before closing this tab:
1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesDo not restore a quarantined copy merely because the installer needs it. Re-enable protection immediately after any controlled troubleshooting, and prefer a clean vendor download over restoring an extracted temporary file.
Fix 3: Check the temporary folder and permissions
An installer can fail when Windows cannot create or read its temporary extraction directory.
- Press Windows key + R.
- Enter
%TEMP%and press Enter. - Leave that window open.
- Start the installer again and watch for a newly created randomly named folder.
- If the folder disappears after failure, that is normal for some installers.
- If the folder remains, check whether it contains installer files or an antivirus-related warning.
- Close the failed installer.
- Restart Windows and try the fresh official installer again.
If only one Windows account experiences the problem, test the installation from a new local administrator account:
- Open Settings.
- Select Accounts, then Other users.
- Select Add account.
- Follow the prompts to create a temporary account.
- Change its account type to Administrator.
- Sign in to that account and run the official installer.
If setup works there, the original profile’s temporary-folder permissions or profile configuration may be involved. Do not copy userinfo.dll between profiles as a workaround.
Fix 4: Repair Windows components only when Windows itself is affected
userinfo.dll is not established as a protected Windows system file, so System File Checker is not the normal repair for this error. Use these commands when Windows has broader problems, such as other genuine system-file errors, broken Windows features, or repeated component failures.
- Open Start.
- Type
Command Prompt. - Right-click Command Prompt and select Run as administrator.
- Select Yes at the User Account Control prompt.
- Run:
DISM.exe /Online /Cleanup-Image /RestoreHealth
- Wait for DISM to finish.
- Then run:
sfc /scannow
- Restart Windows.
- Retry the official application installer.
Microsoft documents these commands in its System File Checker guidance. If both commands complete without finding a problem and the application still reports userinfo.dll, return to the application installer rather than repeating SFC.
SFC and DISM can take time, and manually repeating them does not explain which application file is missing. Outbyte PC Repair can scan for the underlying Windows issues, while its full version performs the repair; reinstalling the affected application remains the definitive fix when the missing file belongs to that installer.
Fix 5: Consider NSIS architecture and plug-in matching
This matters mainly to developers, IT staff maintaining repackaged installers, and users working with customized setup packages.
NSIS 3 can use separate x86-ansi and x86-unicode plug-in directories. The plug-in must match the installer and target type. A 32-bit installer can require an x86 plug-in even when it runs on 64-bit Windows.
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For an NSIS project:
- Identify whether the build uses ANSI or Unicode plug-ins.
- Check the project’s
Pluginsdirectory. - Confirm that the matching
userinfo.dllis present in the correct platform folder. - Rebuild the installer using the plug-in supplied by the same NSIS release or project.
- Test the rebuilt installer on a clean Windows account.
- Verify that the plug-in is embedded and extracted during setup.
Do not replace the file with a random DLL that has the same name. A filename match does not prove that the binary, exports, architecture, or build is compatible.
If you are only installing an application, do not repair NSIS folders manually. Obtain a corrected installer from the application developer.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Fix 6: Update drivers only when the application identifies a driver problem
A driver update is not a normal remedy for userinfo.dll. This file is an installer plug-in, not a hardware driver. Use Device Manager only if the application’s own error or Windows logs identify a separate device problem.
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To check:
- Right-click Start.
- Select Device Manager.
- Expand the category related to the reported device.
- Right-click the device and select Properties.
- Open the Driver tab.
- Review the provider and driver status.
- If an update is required, obtain it from the hardware manufacturer’s official support page.
- Restart Windows and retest the application.
Guessing among dozens of driver packages is usually unrelated to this DLL error. Outbyte Driver Updater can show which drivers are outdated through its free scan, while driver installation is handled by the full version; use it only for an actual driver issue, not as a substitute for reinstalling the affected program.
Check for malware when the file is in a random folder
A copy under %TEMP% is not automatically malicious because installers commonly use temporary directories. Treat it as suspicious when it appears alongside browser redirects, unwanted advertisements, unknown startup entries, or unexplained executables.
Microsoft has documented malware samples that dropped a file with this name into random temporary directories. Run a full scan:
- Open Windows Security.
- Select Virus & threat protection.
- Select Scan options.
- Choose Full scan.
- Select Scan now.
- Review Protection history after the scan.
- Remove the suspicious parent application if Windows identifies one.
If the file came from an unofficial installer, delete that installer and obtain the application from its developer. Do not whitelist the file until its source and detection have been independently assessed.
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- Do not download
userinfo.dllfrom a generic DLL download site. - Do not copy it into
C:WindowsSystem32orC:WindowsSysWOW64. - Do not assume a 64-bit copy is correct for a 32-bit installer.
- Do not run
regsvr32 userinfo.dllas a general repair. - Do not restore an antivirus-quarantined file without verifying the installer.
- Do not install Visual C++, DirectX, or .NET solely because this filename appears.
- Do not use SFC as proof that an application installer is healthy.
regsvr32 is intended for DLLs that expose registration entry points such as DllRegisterServer. An NSIS plug-in is normally loaded by the installer by name and exported function; it does not normally require COM registration. Microsoft explains the command’s purpose in its regsvr32 documentation.
If the error still appears
Before contacting the application developer, record:
- The exact application and installer name
- The complete error text
- The full path shown for
userinfo.dll - Whether the error occurs before or after extraction
- Your Windows edition and architecture
- The antivirus detection name, if any
- Whether a fresh official download produces the same result
- Whether another Windows user account can install it
If every official installer fails, test only under controlled conditions with real-time protection temporarily disabled, then re-enable it immediately. The preferred path is still to submit a suspected false positive to the antivirus vendor.
FAQ
Is userinfo.dll part of Windows?
No reliable evidence identifies it as a standard Windows system component. It should not normally be present in System32 or SysWOW64.
What software uses userinfo.dll?
The strongest documented match is NSIS-based installers. TeamSpeak 3 has also had a reported failure involving its optional Overwolf installation path. Other applications may use the same filename.
Is userinfo.dll a runtime dependency?
Normally no. It is principally an installer plug-in, not a general runtime library.
Should I register it with regsvr32?
Normally no. NSIS plug-ins are loaded by the installer and do not generally require COM registration.
Can I copy the DLL from another computer?
Not as an end-user repair. Different installers may require different builds, exports, or architectures. Reinstall the affected program from its official installer instead.
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Is every userinfo.dll safe?
No. The filename alone proves nothing. A copy from a trusted installer may be legitimate, while one in a suspicious temporary folder may require a malware investigation.
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