Fix Windows Defender Not Starting After Update
After a Windows update, you might see that Windows Defender (now called Microsoft Defender Antivi...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Unlock a File Locked by Windows Security
You try to open, move, or delete a file, but Windows shows a message like "This file is blocked b...
Fix Task Scheduler Error 101: Failed to Start
You see Event ID 101 in the Windows Event Viewer under TaskScheduler, and the task didn't run. Th...
Enable Windows Defender After Disabling Third-Party Antivirus
If you've disabled or uninstalled a third-party antivirus and now find Windows Defender is not au...
How to Fix Windows Security Invalid Configuration Error
If you see a message that says "Invalid configuration" when opening Windows Security, the app usu...
Fix Microsoft Teams Update Configuration Error
When Microsoft Teams fails to update, you may see a message like "Update configuration error" or ...
Topic paths
Quick titles
BitLocker Blank Screen After Sleep: How to FixHow to Resolve Teams Error 0x80070005Update Broke Remote Desktop Auto-Start: Fix GuideDomain User Windows Update Authentication Failure TroubleshootingFix Outlook Authentication Error During SetupWindows Update Stuck? Follow This ChecklistOneDrive Sign-In Loop Not Working GuideBitLocker 502 Bad Gateway Troubleshooting Guide