How to Fix Windows Security Update Failed Errors
You click 'Check for updates' and after a long wait, you see 'Some updates were not installed' or...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listHow to Fix a Stuck Windows Security Virus Scan
You start a Windows Security scan, and it sits at the same percentage for minutes—or even hours. ...
Fix Windows Activation Service Unavailable on Windows 10 Pro
If you see the error 'Windows Activation Service Unavailable' on Windows 10 Pro, it usually means...
Fix 'Turn On Windows Defender Access Denied' Error
You try to turn on Windows Defender, but get an "Access Denied" message. This usually means somet...
Fix Windows Defender Malware Protection History Not Showing
You open Windows Security to review past malware detections, but the protection history section i...
Fix Chrome DNS_PROBE_FINISHED_NXDOMAIN Error
You're trying to load a website in Chrome, but instead you see: This site can't be reache...
Topic paths
Quick titles
Resolve Command Prompt Update HangingChrome Browser Reset Guide: Fix Common ProblemsHow to Handle API Rate Limits in PowerShellHow to Fix Windows Defender 404 Not Found ErrorTroubleshoot Windows Search Indexing IssuesFix Windows Activation Port Already Allocated & Firewall ErrorsOneDrive Sync Fails After Update: How to FixTroubleshoot OneDrive Sync Problems in Windows 10