Microsoft.windows.windowsupdate.ruximlog Failed To Start -

Fixing the "microsoft.windows.windowsupdate.ruximlog failed to start" Error: A Complete Guide

Last Updated: October 2024
Applies to: Windows 10, Windows 11, Windows Server 2019/2022

Fix 7: Disable Third-Party Antivirus Temporarily

Overzealous antivirus (e.g., Avast, Norton, McAfee) can block Windows internal logging components like ruximlog. microsoft.windows.windowsupdate.ruximlog failed to start

  1. Disable real-time protection temporarily.
  2. Attempt to trigger Windows Update manually.
  3. If the error disappears, add C:\Windows\System32\wuaueng.dll and C:\Windows\SoftwareDistribution to your AV exclusion list.

Method 4: Check for Updates

Sometimes, Microsoft releases patches that specifically fix bugs in the background services (like the RUXIM bug). Fixing the "microsoft

  1. Go to Settings > Update & Security > Windows Update.
  2. Click Check for updates.
  3. If updates are available, install them and restart.

6) Inspect Event Viewer and task details

  1. Open Event Viewer → Windows Logs → System and Applications; filter for errors around the time the message appeared.
  2. Note Event ID, source, and any faulting module.
  3. Also check Applications and Services Logs → Microsoft → Windows → WindowsUpdateClient and related subkeys for additional messages.

Use these details to search for targeted fixes (e.g., missing DLLs, permission issues, or failing scheduled tasks). Disable real-time protection temporarily

Fix 6: Adjust Permissions on Windows Update Keys

Sometimes ruximlog fails to start due to incorrect registry permissions.

Warning: Back up your registry before proceeding.

  1. Press Win + R, type regedit, press Enter.
  2. Navigate to: 
    HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\wuauserv
  3. Right-click wuauserv → Permissions.
  4. Ensure SYSTEM and TrustedInstaller have Full Control.
  5. Also check: 
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\WindowsUpdate
  6. Right-click WindowsUpdate → Permissions → Grant SYSTEM Full Control.

Reboot after changes.