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

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

If you see error 0x80090016 when using Windows Search, it usually means the search index or a rel...

You ran Disk Cleanup to clear Windows Update files, but it sits at 'Working on updates' for hours...

When you try to start a local server or application and see an error like "port already in use" o...

You may see a notification that Windows Defender real-time protection has a rate limit error, oft...

If you see a "version mismatch" error when trying to update Windows, it usually means the update ...