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Fix 'Windows Defender Not Recognized' Error in Command Prompt - How to Fix Command Prompt Port Already Allocated Error-How to Fix Command Prompt Blank Screen on Windows 10

Updated 2026-06-14 02:33:58windows-fixes
Fix 'Windows Defender Not Recognized' Error in Command Prompt - How to Fix Command Prompt Port Already Allocated Error-How to Fix Command Prompt Blank Screen on Windows 10
Likely symptom
Likely cause
Safe rollback

Verification route

  • Repeat the original action, not only a simplified test case.
  • Restart the app or reload the service after configuration changes.