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

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

Windows Security (formerly Windows Defender) may fail to open, show a blank page, or refuse to up...

If you're stuck at a blank screen after booting into Safe Mode with BitLocker enabled, you're not...

You try to use Windows Search, but it keeps asking you to sign in again and again—even after you ...

You open Windows Security and see the message 'Windows Defender service unavailable' or 'Windows ...

You open Chrome expecting your bookmarks, passwords, and settings to be up to date, but the sync ...