Microsoft.windows.windowsupdate.ruximlog Failed To Start — Authentic & Full

The error message "Session 'Microsoft.Windows.WindowsUpdate.RUXIMLog' failed to start"

(often accompanied by Event ID 2 and error code 0xC0000035) typically appears in the Windows Event Viewer. While it sounds alarming, it is generally a benign system notification related to

(Reusable UX Integration Manager), a component used by Microsoft to manage background updates and "update health" tools Understanding the RUXIMLog Error

The error usually triggers when the system attempts to start a logging session for an update process that is either already running or has been superseded. Many users have traced this specific log failure to

, a cumulative update designed to improve Windows Update service components.

Because RUXIM is part of the "Update Health Tools," the error signifies that the diagnostic logging session for these tools couldn't initialize properly. In most cases, this does

impact the actual installation of security updates or the stability of your PC. Common Solutions and Mitigations microsoft.windows.windowsupdate.ruximlog failed to start

If you find the error frequently cluttering your logs or suspect it is causing performance lag, you can try these steps: Run System Repairs System File Checker (SFC)

tools to ensure no core system files are corrupted. In an elevated Command Prompt, run: sfc /scannow DISM /Online /Cleanup-Image /RestoreHealth Reset Update Components

: If updates are failing alongside this error, resetting the Windows Update cache can help. This involves stopping the update services and renaming the SoftwareDistribution Manage Update Health Tools

: Some users have resolved the persistent log entry by uninstalling Microsoft Update Health Tools

from the "Apps & Features" menu, then restarting the computer to allow Windows to reinstall a clean version. Registry Adjustment

: A more advanced fix involves navigating to the registry key The error message "Session 'Microsoft

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\WMI\Autologger\RUXIMLog

and deleting it (after backing up the registry), which prevents the system from attempting to start that specific failed session. For the vast majority of users, the

failure is a "ghost" error—a diagnostic session failing to record data for a process that may not even need to run at that moment. Unless your computer is experiencing "soft crashes" or failing to install critical security patches, this error can safely be ignored. step-by-step guide

on how to run the registry fix or reset your update components? Startup Error in Event Viewer - Microsoft Q&A 8 May 2024 —

Here’s a helpful, straightforward write-up on the error: "microsoft.windows.windowsupdate.ruximlog failed to start"

Part 1: Understanding the Error

3. If “ruximlog” is part of a specific software

Search your computer for ruximlog:

dir /s C:\ruximlog*

If found, check which application owns it – likely a network utility, proxy tool, or custom logging framework. Reinstall or update that software.

Method 2: Repair System Files (SFC and DISM)

If the Scheduled Task looks fine, the actual file the task is trying to launch might be corrupted. You can use Windows' built-in tools to repair them.

  1. Press the Windows Key, type cmd.
  2. Right-click "Command Prompt" and select Run as Administrator.
  3. In the command prompt window, type the following command and press Enter: DISM /Online /Cleanup-Image /RestoreHealth (This may take a few minutes to complete.)
  4. Once that finishes, type the following command and press Enter: sfc /scannow
  5. Wait for the scan to reach 100%. If it says "Windows Resource Protection found corrupt files and successfully repaired them," this likely fixed your issue.
  6. Restart your computer.

Fix 1: Repair Windows Update Components Manually (Most Effective)

This reset is the gold standard for Windows Update–related errors.

Step-by-step:

  1. Open Command Prompt as Administrator.
  2. Stop the relevant services: 
    net stop wuauserv
net stop cryptSvc
net stop bits
net stop msiserver
  3. Rename the SoftwareDistribution and Catroot2 folders: 
    ren C:\Windows\SoftwareDistribution SoftwareDistribution.old
ren C:\Windows\System32\catroot2 Catroot2.old
  4. Restart the services: 
    net start wuauserv
net start cryptSvc
net start bits
net start msiserver
  5. Reboot and check Event Viewer for the error.

Why this works: The ruximlog component resides within SoftwareDistribution in some builds. Renaming forces Windows to recreate clean copies.

Quick checklist (copyable)

If you want, provide the exact Event Viewer log text (Event ID and full error message) and I’ll suggest targeted next steps. Part 1: Understanding the Error 3

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