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 listHow to Fix 'Outlook Module Not Found' with Office Repair
If you see an error like "Outlook module not found" when starting Microsoft Outlook, it usually m...
How to Configure Windows Defender Log File Size Limit
Windows Defender (Microsoft Defender Antivirus) writes operational logs that can grow large over ...
Ubuntu APT Lock Troubleshooting Checklist
When you run an apt command and see a message like Could not get lock /var/lib/dpkg/lock-fr...
Fix Windows Defender Can't Connect After Update
After a Windows update, you might see an error that Windows Defender can't connect to the service...
How to Fix Windows Update Error 0x8024402c
When Windows Update fails with error 0x8024402c, it usually means the update client can't connect...
Topic paths
Quick titles
How to Resolve Windows Security DNS IssuesOutlook Port Sharing Issues with Thunderbird and OthersSet Windows Search to Start Automatically with Windows 10Docker Container Cannot Connect to PostgreSQLTroubleshoot Microsoft Store Service UnavailableHow to Resolve Windows Defender Dependency Error in Windows 10Windows 0x803fa067 Activation Error SolutionHow to Reduce Windows Activation Service Memory Usage