Fix Windows Defender Authentication Failed Error in Windows 10
You see a message like 'Windows Defender Authentication Failed' when trying to open or update Win...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Windows Update Service Not Running Automatically
If Windows Update fails to run automatically, you might see errors like "Service not running" or ...
How to Fix Remote Desktop Permission Denied Error
You try to connect to a remote PC using Remote Desktop (RDP) and get an error like "The connectio...
Setup Windows Security to Fix 502 Bad Gateway Error
If you're seeing a 502 Bad Gateway error while running a local web server on Windows, the problem...
How to Fix Error 0x80070643 When Windows Update Fails
Error 0x80070643 typically appears during Windows Update when the system cannot complete an updat...
How to Fix Remote Desktop Connection Refused After a Windows Update
After a recent Windows update, you might see "Remote Desktop Connection Refused"...
Topic paths
Quick titles
Fix Windows Security Not Launching at StartupFix Page Not Found in Microsoft StoreResolve 'Module Not Found' in Task SchedulerResolve BitLocker Freeze During Boot on Solid State and Hard DrivesHow to Clear Windows Defender Cache Without RebootingOutlook Troubleshooting Log File ChecklistFix Windows Defender Stuck on Loading Black ScreenFix Windows Security Offline Installer Fails