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 Windows Defender Connection Refused Error 0x80070005
When you open Windows Defender (Microsoft Defender Antivirus) and see a connection refused error ...
Microsoft Store for Mac: Common Errors and Fixes
If you're using the Microsoft Store on a Mac (via the web or through Office apps), you may run in...
Fix VS Code Terminal Not Opening on Windows 11
If your VS Code terminal refuses to open on Windows 11, you're not alone. This often happens afte...
Fix OneDrive Sync Login Loop on Windows 10
If you're stuck in a OneDrive login loop on Windows 10—where the sign-in screen keeps reappearing...
Fixing Cargo Build Failures on Windows with MSVC Toolchain
If you're using Rust on Windows with the MSVC toolchain and cargo build fails, you'r...
Topic paths
Quick titles
Troubleshoot Windows Security Permission DeniedWindows 10 Activation Fails After Hardware Changes? Here's the FixTask Scheduler Endless Loop Troubleshooting GuideTask Scheduler Dependency Conflict Configuration ChecklistTroubleshoot Outlook High CPU with Repair UtilitiesRemote Desktop Error Code Dependency Fix GuideHow to Kill a Process Using a Port in Command PromptFix PowerShell Startup Error: Missing .NET Framework