
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 restart your PC and notice Windows Security (formerly Windows Defender) isn't running. The ic...

When you try to connect to a remote PC and see “Your credentials did not work” with error code 0x...

You set Windows Terminal to launch automatically when you sign in, but it doesn't start. The sett...

After a Windows upgrade, you might see an error saying the update version doesn't match your syst...

You install a third-party antivirus, but Windows Security still pops up with alerts, or you see e...