Fix Windows Defender Service Not Running
If you see "Windows Defender service not running" or a red warning in Security Center, the underl...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Defender Crash Loop in Windows 10
If Windows Defender keeps crashing and restarting on your Windows 10 PC—showing error messages, d...
Fix Microsoft Store 404 Not Found Error
Seeing a 404 Not Found error when opening the Microsoft Store is frustrating, but it's often fixa...
Fix Node Version Mismatch Error ERR_INVALID_ARG_TYPE
You see ERR_INVALID_ARG_TYPE after a Node.js update or when switching projects. This...
Outlook Rate Limit Error: Complete Troubleshooting Checklist
If you see an error like “You’ve hit a rate limit” or “Too many requests” in Outlook, your accoun...
Fix OneDrive Sync ‘Service Unavailable’ and ‘Permission Denied’ Errors
When OneDrive reports “Service Unavailable” or “Permission Denied” during sync, the problem is us...
Topic paths
Quick titles
How to Fix WinSCP Connection Refused and Permission Denied ErrorsChrome for Mac: Setup and Troubleshooting TipsChrome Update Stuck Error 12 FixSetup and Troubleshoot Windows Search Configuration ToolHow to Fix Command Prompt Failed to Start on Windows 10How to Fix Security Token Expired Errors in Windows DomainGroup Policy Teams Auto-Start TroubleshootingTroubleshooting Windows Update Service Won't Start