Fixing Windows Security 502 Bad Gateway Errors
If you see a 502 Bad Gateway error in Windows Security (or the Windows Defender portal), it usual...
Software comparisons, alternatives, and tool decision notes.
Fit
Decision
Migration
Latest comparisons
Browse labHow to Fix Windows Security Error 'Access Denied' on Startup
If you see a Windows Security error saying 'Access Denied' right when your PC boots up, it usuall...
Fix BitLocker Authentication Failed with TPM Not Working
If BitLocker prompts for a recovery key or shows "Authentication failed" and TPM is not working, ...
Fix Windows Defender 404 Not Found in Group Policy
When you open the Group Policy Management Editor and navigate to Computer Configuration > Adminis...
Fix Windows Security Not Launching After Malware Removal
After removing malware, Windows Security may fail to launch or show a blank window. This is often...
Fix Windows Defender Update Error 0x80070490 on Windows 11
If you see error 0x80070490 when trying to update Windows Defender on Windows 11, it usually mean...