Session Windowsupdatetracelog Failed To Start With The Following Error 0xc0000035 May 2026

A: This indicates a persistent scheduler or task is trying to start the trace session twice. Run schtasks.exe and look for any custom update-related tasks. Also, check for remnants of older Windows Update agents in C:\ProgramData\Microsoft\Diagnosis\ETLLogs . Conclusion The error "Session WindowsUpdateTraceLog failed to start with the following error 0xc0000035" is fundamentally a communication breakdown within Windows' own logging infrastructure. While the cryptic error code suggests a deep registry failure, the reality is far more manageable.

net stop wuauserv net stop cryptSvc net stop bits net stop msiserver ren C:\Windows\System32\catroot2 catroot2.old ren C:\Windows\SoftwareDistribution SoftwareDistribution.old A: This indicates a persistent scheduler or task

Introduction Windows Update is the lifeblood of system security and feature stability on Microsoft operating systems. However, it is also notoriously sensitive to corruption, misconfigurations, and resource conflicts. One of the more cryptic errors that administrators and users encounter when digging into the WindowsUpdate.log or the Event Viewer is: "Session "WindowsUpdateTraceLog" failed to start with the following error 0xc0000035." At first glance, this error looks like a critical system failure. The hexadecimal code 0xc0000035 can be intimidating, but it is a well-known status code in the Windows kernel: STATUS_OBJECT_NAME_COLLISION . In plain English, this means "a file, registry key, or object with that name already exists." However, it is also notoriously sensitive to corruption,

By using the logman tool to manually stop the duplicated ETW session, you can resolve the collision in under 30 seconds. Windows Update will immediately regain its ability to download and install updates. In plain English

ETW is a high-performance logging mechanism built into the operating system. It allows services like Windows Update to log diagnostic data without slowing down the system.