Windows Update is the lifeline of any PC running Microsoft Windows. It delivers critical security patches, driver updates, and feature improvements. However, when Windows Update breaks, the error messages can be cryptic and frustrating.
One such obscure error is: "microsoft.windows.windowsupdate.ruximlog failed to start."
If you are seeing this message in your Event Viewer, or if Windows Update is stuck and you traced the issue back to this specific log entry, you are likely confused about what ruximlog is and why it’s failing.
This article will explain what this error means, why it occurs, and—most importantly—how to fix it permanently. microsoft.windows.windowsupdate.ruximlog failed to start
If the error persists, the issue lies deeper within the Windows Update infrastructure. Resetting the components often clears the "failed to start" log error.
Open Command Prompt as Administrator (as described in Method 2).
Type the following commands one by one, pressing Enter after each: Fixing the "microsoft
net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 catroot2.old
net start wuauserv
net start cryptSvc
net start bits
net start msiserver
After executing these commands, wait a few moments and restart your computer. Windows will automatically rebuild the folders you renamed.
If all else fails, an in-place upgrade reinstalls Windows while keeping your apps and files.
This replaces corrupt Windows Update components, including ruximlog, with fresh ones from the latest build. Open Command Prompt as Administrator (as described in
| Aspect | Details |
|--------|---------|
| Is it a Microsoft file? | No — ruximlog is not a legitimate Windows component. |
| Common cause | Leftover scheduled task or service from third-party software or a corrupted entry. |
| Danger level | Low, but scan for malware to be safe. |
| Easiest fix | Search Task Scheduler and Services for ruximlog, then disable/delete. |
| Best practice | Use Autoruns or Registry Editor to remove all traces. |
If you’re unsure about any step, post a screenshot of the full Event Viewer error message in a tech support forum (like Reddit’s r/WindowsHelp or Microsoft Community) for further guidance.
An in-place upgrade reinstalls Windows while keeping your files and apps. It is the most thorough fix without wiping your drive.
ruximlog error.