How to Fix Windows Defender 'Command Not Found' Error
You open Command Prompt to run MpCmdRun.exe or Get-MpPreference and get...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listFix Windows Activation Error 504 Caused by Firewall Settings
You try to activate Windows and get error 504. This often means your firewall is blocking communi...
Fix Windows Update Authentication Failed / Permission Denied
When Windows Update fails with an "authentication failed" or "permission denied" message, it usua...
How to Enable Windows Defender Service Manually
If Windows Defender won't start or you see warnings that it's turned off, the underlying service ...
How to Enable Windows Search Service in Windows 10
If Windows search is not working—no results appear when you click Start or File Explorer—the Wind...
Microsoft Store Authentication Failed: Quick Fix Checklist
You open the Microsoft Store, try to sign in, and get an authentication failed error. This can ha...
Topic paths
Quick titles
WinRAR Checksum Error and Permission Denied FixWindows Search Not Loading? Here's How to FixFix 'Microsoft Store command not found' in PowerShellFix Windows Update Error 0x800f081f with DISM Restore HealthReduce Windows Terminal Memory ConsumptionFix Windows Activation Module Not Found ErrorDeploy PowerShell Offline on Multiple PCsFix Windows Defender Login Loop After Update