Fix 'Not Recognized as Internal or External Command' Error
You type a command in Command Prompt and see "'command' is not recognized as an internal or exter...
Checklists for software errors, setup, and tool workflows.
1. Reproduce
2. Isolate
3. Apply
4. Verify
Latest checklists
View listMicrosoft Store Rate Limit Error: Practical Checklist
You're trying to download an app or update from the Microsoft Store, but you get an error about r...
How to Fix Windows Search Token Expired Error
When you search for files or apps in Windows and see a 'token expired' error, it usually means th...
Fix Outlook Slow Sending and Receiving Emails
You open Outlook, click Send/Receive, and wait. And wait. Emails trickle in or won't go out. This...
How to Fix Windows Defender 404 Not Found Error
If you see a "404 Not Found" error when opening Windows Defender, it often means a required file ...
Fix 'Permission Denied' Error on Windows Update Log File
When you try to open the Windows Update log file (usually %windir%\WindowsUpdate.log...
Topic paths
Quick titles
OneDrive Sync Error 0x8004deb4 TroubleshootingHow to Schedule Defender Scans on Several DrivesMicrosoft Store CPU Spike Troubleshooting GuideFix 0x80072F8F SSL Certificate Error in Windows ActivationFix Windows Terminal Stuck on InitializingTroubleshoot Command Prompt Startup CrashResolve Remote Desktop 404 Error Due to Missing Web InterfaceHow to Configure Python in Command Prompt