
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 ...

You open Chrome, but a page just spins or shows a blank white screen. This can happen on any site...

You may see an error like 'Windows Update version mismatch' or 'Sync failed' when trying to updat...

You open Outlook and it hangs on 'Loading profile...' or gets stuck in a repair loop. This usuall...

After clearing Windows Terminal cache—often to fix display or settings issues—you may find the ap...

When Firefox shows a 'Secure Connection Failed' error and mentions the time or date is wrong, it ...