Fix Windows Security Error 404 After Update
After a recent Windows update, you might see an error 404 when opening Windows Security. The app ...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix Windows Security Not Responding
Windows Security (formerly Windows Defender Security Center) may stop responding, hang on launch,...
Fix Windows Security Virus Scan Slow Performance
If your Windows Security (formerly Windows Defender) virus scan takes forever or slows down your ...
How to Fix Chrome Update Error 12 Without Resetting
If you see Chrome Update Error 12, the update process failed. This often happens...
Fix Microsoft Store Error 0x80073cf0 When Updating Apps
When you try to update apps in the Microsoft Store, you may see error code 0x80073cf0. This usual...
How to Stop Command Prompt from Freezing on Startup
If Command Prompt (cmd.exe) freezes or hangs shortly after opening, it's usually due to a startup...
Topic paths
Quick titles
Terminal Service Won't Start: Troubleshooting StepsResolve Windows Security 0x80070422 Version MismatchHow to Resolve Task Scheduler Proxy Sync ProblemsFix 'Command Not Found' in Windows Terminal When Antivirus Is ActiveHow to Resolve Security Token Expired in WindowsWindows 10 Activation Permission Denied FixFix OpenVPN Permission Denied on Tun DeviceWindows Update 0x80072f0d SSL Certificate Fix