The error "Session 'Microsoft.Windows.WindowsUpdate.RUXIMLog' failed to start" is a common Windows Event Viewer log entry (often Event ID 2). While it looks alarming, it is usually a non-critical logging conflict rather than a system failure. 1. Understanding the Error What is RUXIM? RUXIM stands for Reusable UX Integration Manager , a component used by Windows Update (specifically related to the PLUGScheduler task) to manage update notifications and diagnostic data. The Cause (Error 0xC0000035): This specific error code usually translates to STATUS_OBJECT_NAME_COLLISION . In simple terms, the logging service tried to create a log file (like RUXIMLog.001.etl ) but found that a file or object with that name already exists, causing the session start to fail. Context: It is frequently triggered by update KB5001716 , which updates Windows Update Service components. 2. Impact Assessment Typical Behavior: For most users, this error can be safely ignored . It represents a failed attempt to start a telemetry/logging session, but it typically does not prevent Windows from downloading or installing updates. When to Worry: If this error is accompanied by actual Windows Update failures (e.g., updates stuck at 0%) or frequent system crashes, it may indicate a broader system file corruption. 3. Recommended Troubleshooting Steps If you want to clear the error from your logs or are experiencing related update issues: Run System Repairs: Use built-in tools to fix corrupted files that might be interfering with the logging service. Open Command Prompt as Administrator. Run: DISM /Online /Cleanup-Image /RestoreHealth . After that, run: sfc /scannow . Clear the RUXIM Registry Key: If the error persists, you can manually delete the Autologger entry to force it to reset. Press Win + R , type regedit , and hit Enter. Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\WMI\Autologger . Find Microsoft.Windows.WindowsUpdate.RUXIMLog , right-click it, and select Delete . Restart your computer. Standard Update Troubleshooter: Use the Windows Update Troubleshooter found in Settings > System > Troubleshoot to resolve general update service issues. Are you seeing this error alongside specific update failure codes like 0x80070643, or is it just appearing in your Event Viewer logs? Startup Error in Event Viewer - Microsoft Q&A
The error message "Session 'Microsoft.Windows.WindowsUpdate.RUXIMLog' failed to start" , often accompanied by error code 0xC0000035 , is a common entry found in the Windows Event Viewer. While it can appear alarming, it generally indicates a logging collision rather than a critical system failure. Understanding RUXIMLog and Error 0xC0000035 RUXIM (Reusable UX Integration Manager) is a legitimate component of the Windows Update system used to manage interaction campaigns and keep the OS performing properly. The RUXIMLog specifically refers to diagnostic log files generated during these processes. The error code 0xC0000035 typically translates to STATUS_OBJECT_NAME_COLLISION , meaning the system tried to create a logging session with a name that already existed. In most cases, if your computer is receiving updates and running normally, this error can be safely ignored. How to Fix RUXIMLog Failed to Start If this error coincides with actual Windows Update failures, use the following troubleshooting methods: 1. Run the Windows Update Troubleshooter This built-in tool identifies and automatically repairs common update service issues. Windows 11: Go to Start > Settings > System > Troubleshoot > Other troubleshooters and select Run next to Windows Update. Windows 10: Navigate to Settings > Update & Security > Troubleshoot > Additional troubleshooters and run the Windows Update troubleshooter. 2. Clear the Windows Update Cache Corrupted temporary files in the update folder often cause service start failures. Press Win + R , type services.msc , and hit Enter. Locate Windows Update , right-click it, and select Stop . Open File Explorer and go to C:\Windows\SoftwareDistribution . Delete all files and folders inside this directory. Return to the Services window, right-click Windows Update , and select Start . 3. Repair System Files (SFC and DISM) Corrupted system components can prevent RUXIM from starting its logging session correctly. Troubleshoot problems updating Windows - Microsoft Support Run the Windows Update troubleshooter: * Select Start > Settings > System. * Select Troubleshoot and choose Other troubleshooters. Microsoft Support
This error indicates that a scheduled task belonging to the Windows Update mechanism (specifically the RUXIM interaction logger) failed to launch. While the error looks alarming in the Event Viewer, it is generally considered a benign (harmless) issue and rarely affects the actual installation of Windows updates. Here is the proper technical report regarding this error, including the cause and resolution steps.
Technical Report: Microsoft.Windows.WindowsUpdate.RUXIMLog Failure Event ID: 7000 / 10010 (General Task Start Failure) Source: Task Scheduler Task Name: Microsoft.Windows.WindowsUpdate.RUXIMLog Severity: Warning / Error (Functional Impact: Low) 1. Executive Summary The scheduled task Microsoft.Windows.WindowsUpdate.RUXIMLog attempted to start but failed. This task is part of the RUXIM (Recommended Updates and Experience Interaction Monitor) subsystem. Its primary purpose is to interact with the user regarding optional updates or feature recommendations. The failure of this task does not prevent critical security updates from installing; it only affects certain notification behaviors. 2. Root Cause Analysis There are two primary causes for this error: microsoft.windows.windowsupdate.ruximlog failed to start
Race Condition (Most Common): The task is triggered at logon. It attempts to launch a process (usually ruxim.exe or similar) before the Windows Shell (Explorer) has fully initialized. Because the process relies on user-interface elements that aren't ready yet, the launch fails. Corrupt Task Definition: The scheduled task definition in the Windows Task Scheduler is missing arguments or points to a non-existent executable path (often due to a corrupted Windows Update cleanup).
3. Verification To verify the status of the task, perform the following:
Open Event Viewer ( eventvwr.msc ). Navigate to Windows Logs > System . Look for the error; the details will typically show a return code (often 2147942402 - File Not Found, or 2147942593 - Not Ready). Open Task Scheduler ( taskschd.msc ). Navigate to Task Scheduler Library > Microsoft > Windows > WindowsUpdate . Locate the RUXIMLog task. Check the "Last Run Result" and the "Actions" tab. The error "Session 'Microsoft
4. Recommended Resolution Method A: Safe to Ignore (Recommended) Since this task involves "Recommended Updates" and logging rather than critical system security, the failure has negligible impact on system performance or stability. If Windows Updates are otherwise installing correctly, no action is required. Method B: Delete and Reset the Task (If you wish to clear the error) If the error is cluttering your logs, you can reset the task scheduler definitions using PowerShell.
Right-click the Start button and select Windows PowerShell (Admin) or Terminal (Admin) . Run the following command to delete the potentially corrupted task: Unregister-ScheduledTask -TaskName "Microsoft.Windows.WindowsUpdate.RUXIMLog" -Confirm:$false
(Note: Windows may automatically regenerate this task during the next cumulative update or via the SIH client.) Understanding the Error What is RUXIM
Method C: System File Check If you suspect broader Windows Update corruption:
Open Command Prompt as Administrator . Run: sfc /scannow Run: `D
