How to Reinstall Windows Defender in Windows 11
If Windows Defender (Microsoft Defender Antivirus) is missing, disabled, or not working correctly...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listChecklist: Troubleshoot Windows Search Permission Denied
When you search for files or settings in Windows and get a 'Permission Denied' or 'Access Denied'...
Fix Microsoft Store Blank Screen When Opening an App
You launch an app from the Microsoft Store, and instead of the app window, you get a blank screen...
Windows Defender Real-Time Protection Won't Turn On: Fixes
You open Windows Security, toggle real-time protection on, but it slides back to off. This is a c...
Fix NVM Command Not Found on Windows
After installing NVM for Windows, you may open a new terminal, type nvm, and get an ...
Fix Windows Update Error 0x800f0905 on Mac
When running Windows on a Mac—either through Boot Camp or a virtual machine—you might encounter u...
Topic paths
Quick titles
Error 1033 Cloudflare Tunnel GuideUbuntu Snap Not Working in WSL? Fix ItWindows Defender Credential Loop TroubleshootingResolve Windows Terminal Restore Error 0x80070005OneDrive Connection Refused: Proxy Fix GuideHow to Change PowerShell Execution PolicyOutlook Error 0x8004010f During Backup/Restore FixMicrosoft Store Access Denied Error 0x80070005 Guide