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 Security Access Denied When Opening Settings
You click Windows Security in the Start menu or try to open Virus & threat protection, and instea...
Force Install Windows Update When File Is Locked
You’ve downloaded a Windows update but the installer says a file is locked. This often happens wh...
How to Fix Windows Defender Setup When Version Mismatch Occurs
You try to enable or update Windows Defender, but get an error about a version mismatch. This typ...
How to Fix Windows Security Not Opening
You click the Windows Security icon in the taskbar or open it from Settings, but nothing happens—...
How to Clear Windows Update Cache in Windows 10
If Windows Update is stuck, failing with errors, or taking too long to check for updates, a corru...
Topic paths
Quick titles
Troubleshoot Windows Search Startup FailureWindows 10/11 Update Error 0x800f0922 Proxy FixExternal Drive Missing from Windows Search FixFix Windows Security Rate Limit & Permission ErrorsReinstall Microsoft Store via PowerShellHow to Fix PowerShell Script Log IssuesHow to Fix Windows Terminal Connection Timeout ErrorFix PowerShell Execution Policy Error on Windows