Fix Windows Defender 404 Not Found Error on Windows 10
You click to open Windows Defender Security Center and see a 404 page, or the Settings app shows ...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix PowerShell Crash with Exit Code 0xc0000005
You launch PowerShell, it starts to load, then crashes immediately with exit code 0xc000000...
Windows Search Connection Refused: Quick Troubleshooting Checklist
If Windows Search suddenly stops working and you see a 'connection refused' error when trying to ...
Fix Chrome Connection Timeout and Sync Issues
You try to sync Chrome bookmarks, passwords, or settings, but Chrome shows a connection timeout e...
Fix DNS Errors in Windows Terminal Using Command Prompt
If you get DNS errors in Windows Terminal—like DNS_PROBE_FINISHED_NXDOMAIN or ...
How to Fix Windows Defender 504 Timeout Error
You open Windows Security or try to run a scan, and instead see a 504 timeout error. This typical...
Topic paths
Quick titles
Fix Firefox SSL Error After Browser UpdateWhy Conda Activate Fails and How to Solve ItHow to Reset Windows Defender Settings to DefaultOneDrive Error 0x80070194: How to Fix Sync ProblemsFix Task Scheduler Auto Start Not WorkingGet Chrome Offline Installer for No-Internet PCRelocate Windows Security Event Log Using RegistryBitLocker High CPU After Update: Fixes That Work