How to Enable Windows Defender After It Failed to Start
If Windows Defender won't start, you may see an error like "This app has been turned off" or "Win...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listWindows Security Stuck Loading: Practical Fix Checklist
Windows Security (formerly Windows Defender Security Center) sometimes gets stuck on a loading sc...
Fix Windows Security Version Mismatch Error
You open Windows Security and see an error like "Version mismatch" or "This app can't open becaus...
Fix OneDrive Sync Proxy Server Network Error
If you see a 'proxy server network error' while using OneDrive, it usually means your PC is tryin...
Fixing Windows Terminal 404 Errors: A Practical Guide
You open Windows Terminal and see a 404 error when trying to launch a profile. This usually means...
Fix Windows Activation Cannot Connect to Organization Server
You see the error 'Windows can't activate. Can't connect to your organization's activation server...
Topic paths
Quick titles
Microsoft Store Proxy Error Fix for Windows 10Fix Chrome Extension Disabled AutomaticallyFix Microsoft Store Blank Screen When wsreset FailsFix OBS Black Screen After Update: Practical StepsStop Chrome from Asking to Log In to Your ProfileWSL Ubuntu No Internet: Quick FixesHow to Fix Git Permission Denied (publickey) ErrorPre-Migration Checklist for Switching to Office 365