
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...

An Outlook SSL certificate error accompanied by a 'permission denied' message usually appears whe...

You open Outlook and see an error about a version mismatch, or Outlook won't start because of a r...

When you try to edit the registry to fix Windows Update and get an 'access denied' error, it usua...

If the Microsoft Store is missing, crashing, or won't open in Windows 10, you can reinstall it us...

You try to install or update an app from the Microsoft Store, but it fails with an error like