
Windows Defender Authentication Failed: Step-by-Step Checklist
You open Windows Security and see 'Authentication failed' when trying to use Windows Defender. Th...

You open Windows Security and see 'Authentication failed' when trying to use Windows Defender. Th...

You click the new tab button (or press Ctrl+T) and Firefox freezes, goes white, or shows a spinni...

You open Chrome and see a message that your profile token has expired. This usually means Chrome ...

If you see error code 0x8004de40 when trying to sync files in OneDrive, it usually means the sync...

You try to open, move, or delete a file, and Windows tells you the file is locked by Windows Defe...

You sign in to Microsoft Teams, the window flashes or restarts, and you're back at the login scre...