
Windows Security Troubleshooting Checklist
If Windows security features aren't working as expected—like Windows Defender won't start, update...

If Windows security features aren't working as expected—like Windows Defender won't start, update...

You open Windows Security and see a red banner: “Virus & threat protection turned off.” This can ...

You try to unlock a BitLocker-encrypted drive on a different computer, and get an error about a v...

You open Chrome, and instead of your usual start page, you see a "504 Gateway Timeout" error. Thi...

If Outlook crashes or shows error 0x80004005 when launching or performing an act...

If you've ever set a task to run every minute only to find it stacking up instances or hammering ...