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 listFix Windows Defender Permission Denied When Scanning a Folder
You try to scan a folder with Windows Defender and see 'Permission Denied' or 'Access Denied'. Th...
Fix 'PowerShell Invalid Configuration in Registry' Error
If you see an error like “PowerShell Invalid Configuration in Registry” when launching PowerShell...
Fix 'Outlook Command Not Found' Error When Opening
When you type 'outlook' in a terminal or run a shortcut and get 'command not found', it usually m...
Windows Activation Module Not Found After Update: Fix
After a recent Windows update, you may see an error that the activation module is missing or not ...
Fix Windows Defender SSL Certificate Sync Errors
You might see a warning that Windows Defender can't update because of an SSL certificate error. T...
Topic paths
Quick titles
Task Scheduler File Locked: Causes and FixesHow to Fix Windows Activation DNS ErrorHow to Fix Chrome Profile Issues with Offline InstallerSpeed Up BitLocker Boot Time SettingsPowerShell DNS Query Access Denied TroubleshootingHow to Resolve Windows Activation Error 0x8007007bFix Remote Desktop Token Expired on Windows 10Fix OBS Black Screen After Game Capture Setup