
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...

You open Windows Security and it just spins—loading forever. This is a known issue on Windows 10 ...

You open the Microsoft Store or a Store app and see an error like 'module not found' or 'DLL not ...

After a Windows update, you might see an error saying the Terminal Service is unavailable. This u...

If you see a warning that real-time protection is off, or you suspect your PC is vulnerable, here...

Task Scheduler may stop running scheduled tasks or show outdated statuses when its cache becomes ...