A: No. If you ignore it, Windows Update will remain in a degraded state. You won't receive security patches, leaving your system vulnerable.
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. A: No. If you ignore it
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: No. If you ignore it