
Windows Defender Service Troubleshooting Checklist
If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...

If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...

If OneDrive stops syncing and you see errors like "We can't sync" or files stay stuck on "Sync pe...

If you see a "504 Gateway Timeout" error when syncing OneDrive, it usually means the sync service...

You set up File History on Windows 10, but backups aren't running, or the drive isn't detected. T...

You try to start a local server or application and get an error saying the port is already alloca...

After a Windows update, some users see a BitLocker prompt that says authentication failed. The sy...