Fix Missing Windows Security After Update
After a Windows update, you might find that Windows Security (formerly Windows Defender) is missi...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Activation DNS Error After Network Change
If you recently changed networks (e.g., moved from home to office, switched ISPs, or changed rout...
Windows Security 404 Not Found: Setup and Fix Guide
When you open Windows Security (formerly Windows Defender) and see a blank page or a '404 Not Fou...
Fix Microsoft Store 502 Bad Gateway Due to Network Settings
You open the Microsoft Store and see a '502 Bad Gateway' error. This often means your device cann...
Windows Security Log 4625 Failed Login Troubleshooting
When you see event ID 4625 in the Windows Security log, it means an account failed to log on. Thi...
Windows Defender Offline Scan Not Working After Update: Fixes
After a Windows Update, you might find that the Windows Defender offline scan option is missing, ...
Topic paths
Quick titles
Cloudflare SSL Flexible Redirect Loop FixWindows Defender Connection Refused: Fix Error 0x80070005Microsoft Teams Not Opening After Update: How to FixMicrosoft Teams 502 Bad Gateway Error: Troubleshooting ChecklistPowerShell vs CMD: Command Not Found TroubleshootingFix Chrome Profile Error: Network Issue GuideMicrosoft Teams Won't Auto-Start After Update: TroubleshootHow to Fix Windows Search Installer Missing Files