How to Fix Windows Defender Authentication Failed Error
If you see "Authentication failed" when opening Windows Defender or trying to run a scan, it usua...
Software comparisons, alternatives, and tool decision notes.
Fit
Decision
Migration
Latest comparisons
Browse labFix Windows Security Reset Settings Not Working
If you've tried to reset Windows Security settings to default and the option doesn't respond, you...
Fix Windows Defender Virus Definition Update Failed
You see an error that Windows Defender virus definition update failed. This usually happens when ...
Fix Windows Defender DNS Error on Windows 11
You open Windows Security and see a warning about a DNS error, or Windows Defender cannot update ...
Fix OneDrive Sign-In Problem After Update
After a Windows or Microsoft 365 update, OneDrive may get stuck on the sign-in screen or show err...
Fix Windows Update Error 0x80070643 Installation Failed
You see error 0x80070643 when trying to install a Windows update, and the setup fails partway thr...