
Fix Windows Defender Access Denied Error on Startup
If you see 'Windows Defender failed to start access denied' when you open Windows Security or aft...
Software troubleshooting desk

If you see 'Windows Defender failed to start access denied' when you open Windows Security or aft...

After a recent Windows update, you open the Microsoft Store and see 'Error 502 – Bad Gateway'. Th...

After a Microsoft Teams update, some users get stuck in a login loop: they enter credentials, see...

If you see 'OneDrive sync service unavailable' when trying to sync files in Office 365, the sync ...

You try to open Windows Defender Security Center or run a scan, but get an error: "Windows Defend...

If you're seeing a 504 Gateway Timeout when connecting to Remote Desktop via an RD Gateway that u...