Session Windowsupdatetracelog Failed To Start With The Following Error 0xc0000035 ~upd~ Official

In plain English: Windows is trying to start a tracing session (a log that tracks what Windows Update is doing), but it’s hitting a snag because a session with that same name or ID is already running or wasn't shut down properly. It’s like trying to save a file in a folder where a file with that exact name is already open. Is This Critical?

The 0xc0000035 error is rarely a "system killer." It’s a minor conflict in how Windows tracks its own update progress. By clearing the folder or restarting the update services, you usually tell Windows to stop overthinking and start the log fresh. In plain English: Windows is trying to start

This error is essentially a "traffic jam" in your system's logging department. Here’s a quick breakdown of why it happens and how to clear it up. What Does This Error Actually Mean? The 0xc0000035 error is rarely a "system killer

Usually, . If your computer is running smoothly and Windows Updates are installing correctly, this is often just "log noise." However, if it’s cluttering your Event Viewer or you’re having trouble updating Windows, you should address it. How to Fix It 1. The "Clean Slate" Reboot Here’s a quick breakdown of why it happens

You may need to take ownership of this folder to delete files inside it.

Fix: Session "WindowsUpdateTracelog" failed to start with error 0xc0000035

Delete the contents of the RtBackup folder and restart your PC. Windows will recreate these files cleanly upon reboot. 3. Restart the Windows Update Services Sometimes the service responsible for the trace is hung.