Fix Windows Defender Service Authentication Failed Error
You might see the error 'Windows Defender service authentication failed' when trying to open Wind...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Update Failed to Start After Reboot
You’ve just restarted your PC after installing updates, but Windows Update won’t start. The updat...
Windows Security Troubleshooting Guide
Windows Security (formerly Windows Defender) usually runs quietly in the background, but sometime...
How to Temporarily Turn Off Windows Security for Troubleshooting
If you're troubleshooting a stubborn app or driver issue, Windows Security (formerly Defender) mi...
OneDrive Sign-In Stuck on 'Verifying'? Try These Fixes
If OneDrive hangs on the 'Verifying' screen when you try to sign in, it usually means the app can...
How to Resolve PowerShell Connection Timeout
When you see a connection timeout in PowerShell, it usually means a remote command or script can'...
Topic paths
Quick titles
How to Enable Windows Defender When It FailsFix Windows Update Rate Limit Errors via Network ConfigurationFix Task Scheduler 'Unable to Connect to Network Resource' ErrorFix Windows Search "Access Denied" via Group PolicyHow to Fix Microsoft Store After Network ChangeBackup Windows Search Index: ChecklistTroubleshoot Windows Terminal Update Startup IssueFix Windows Defender Module Not Found Error