Run the WMIDIAG script to diagnose and fix common WMI issues automatically. 2. Rebuild the WMI repository by stopping the winmgmt service, renaming the Repository folder, and restarting the service to trigger regeneration. 3. Re-register WMI DLLs using regsvr32 and recompile MOF files with mofcomp to restore missing or unregistered components. 4. Repair corrupted system files using DISM and SFC tools to address underlying OS issues affecting WMI. 5. Reset WMI security permissions via wmimgmt.msc by restoring default settings for SYSTEM, Administrators, and Authenticated Users. 6. Use WMI Control (wmimgmt.msc) as a final step to clear logs, check errors, and rebuild WMI if the option is available. After completing these steps in order and rebooting, WMI functionality should be restored, and dependent tools like Event Viewer or monitoring software should work properly again.

Fixing a corrupted WMI (Windows Management Instrumentation) in Windows can be necessary when system tools like Event Viewer, Performance Monitor, or third-party monitoring software stop working properly, or when you see WMI-related errors in logs or during updates. WMI corruption can occur due to failed updates, misconfigured permissions, or damaged repository files.

Here’s how to fix a corrupted WMI in Windows — follow these steps in order, testing after each one to see if the issue is resolved.

1. Run the WMI Diagnostic Tool (WMIDIAG)

Microsoft provides a script called WMIDIAG that checks for common WMI issues and attempts to fix them automatically.

• Download the WMIDIAG script from Microsoft’s official site or use the version included in the Windows Assessment and Deployment Kit (ADK).
• Run it from an elevated Command Prompt:

  cscript WMIDiag.vbs

• The script will analyze WMI health and suggest fixes. Follow its recommendations.

This is a good first step because it identifies specific problems rather than applying broad fixes.

2. Rebuild the WMI Repository

If the repository is corrupted, rebuilding it often resolves the issue. This is safe — Windows will regenerate the repository from known good components.

?? Note: Rebuilding the repository will remove any custom WMI namespaces or providers you've added. Most users don’t have these, so it's generally safe.

Steps:

1. Open Command Prompt as Administrator.
2. Stop the WMI service:

   net stop winmgmt

3. Navigate to the WMI repository folder:

   cd /d %windir%\system32\wbem

4. Rename the repository folder to back it up:

   ren Repository Repository.bak

5. Restart the WMI service (this triggers rebuild):

   net start winmgmt

The system will automatically recreate the Repository folder on restart. This may take a few minutes.

6. Reboot the computer and test WMI functionality.

3. Register WMI DLLs and Recompile MOF Files

Sometimes, WMI components become unregistered. You can manually re-register core DLLs and recompile MOF (Managed Object Format) files.

Run these commands in an elevated Command Prompt:

for /f %s in ('dir /b *.dll') do regsvr32 /s %s

Then recompile all .mof and .mfl files:

for /f %s in ('dir /b *.mof *.mfl') do mofcomp %s

This ensures all WMI classes and providers are properly registered.

4. Check and Repair System Files

Corrupted system files can affect WMI. Use built-in tools to scan and repair.

Run DISM:

DISM /Online /Cleanup-Image /RestoreHealth

Run SFC:

sfc /scannow

These tools fix underlying OS file corruption that might be contributing to WMI issues.

5. Reset WMI Security Permissions (if needed)

Incorrect WMI permissions can mimic corruption. Use wmimgmt.msc to check:

1. Press Win R, type wmimgmt.msc, and press Enter.
2. Right-click WMI Control (Local) → Properties → Security tab.
3. Select Root → click Security.
4. Ensure SYSTEM, Administrators, and NT Authority\Authenticated Users have proper access (typically "Enable Account" and "Remote Enable").
5. Click Advanced → Restore Security Defaults if available.

This resets WMI namespace permissions to default.

6. Use the WMI Control (Optional Reset)

As a last resort, you can use WMI Control to clear errors:

1. Run wmimgmt.msc
2. Right-click WMI Control (Local) → Rebuild (if available) or Properties.
3. Go to the Logging tab and clear logs if they're full.
4. Check for errors under the General tab and note them.

Final Notes

• After fixing WMI, some services (like Group Policy, SCCM, or monitoring tools) may need a restart.
• If you're on a domain, ensure Group Policy isn’t pushing conflicting WMI settings.
• Always back up critical data before making system-level changes.

Most WMI issues are resolved by rebuilding the repository and re-registering components. Start with WMIDIAG or SFC, then proceed to rebuild if needed.

Basically, it's not complex — but easy to skip a step. Follow the order above, and WMI should come back healthy.

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