Fix Windows Defender Error 0x800106ba: Failed to Start
If you see “Windows Defender failed to start” with error code 0x800106ba, the Windows Defender se...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix OneDrive Sync Error 0x8007017c on Mac
You're syncing files in OneDrive on your Mac when a notification pops up: "We can't sync this fil...
How to Fix BitLocker 404 Not Found and Permission Denied Errors
If you're seeing a '404 not found' or 'permission denied' error when trying to access or manage B...
Fix Windows Defender Service Authentication Failed Error
You might see the error 'Windows Defender service authentication failed' when trying to open Wind...
BitLocker Invalid Configuration Recovery Key Error Fix
When BitLocker prompts for a recovery key and then shows an "invalid configuration" error, the dr...
Windows Security App Not Working After Update: Fixes
After a Windows update, the Windows Security app may fail to open, show a blank screen, or displa...
Topic paths
Quick titles
Windows Update Service Automatic Start FixTeams Network Error 0x80070005 Fix GuideResolve 'Connection Refused' in Teams on Windows 10Troubleshoot OBS Virtual Camera Zoom DetectionFix Command Prompt Error 5: Access Is DeniedHow to Resolve Windows Update 504 Gateway Timeoutnvm 'not recognized' Error Windows 10 SolutionRemote Desktop Permission Denied: Quick Fixes