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When I open Start > Run, type cmd.exe and press Enter, a black window shows up and disappears immediately.

  • I've tried opening it from C:\windows\System32\cmd.exe
  • I've tried cleaning the PATH environment variable

However none of these have made any difference. Does anyone have an idea what the problem could be?

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up vote 4 down vote accepted

I had this problem and solved it in the following way:

Go to the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Command Processor

It has an AutoRun value set to (Exit). Delete this value and the Command Prompt should work again.

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I faced this issue once, and this probably looks like a virus/worm issue. Check if your Task Manager & Registry Editor is disabled?

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Do you mean to check if I can open the Task manager and the Registry editor ? if so, I can open them and they work fine. – Nour Sabouny Jun 14 '11 at 7:33
    
@Nour: Can you try to get a screenshot of Command Prompt just before exiting? Also, which Windows you are running? Also, Can you try running from different user account, maybe Administrator? – anilmwr Jun 14 '11 at 9:30
    
I'm running windows 7 with administrator user and I tried to run as administrator , I also tried to get a screen shot and there is no error message, just the normal message of the command prompt. (Microsoft Windows Version 6.1.7600) Copyright (C) ..... – Nour Sabouny Jun 14 '11 at 14:21
    
@Nour: If your system is really infected, then I don't think that just renaming cmd.exe will work. I had issues with Sysinternal's Process Explorer, the malware used to kill it even when I renamed the EXE. Looked like it was checking the Application Title. Also, If you're getting Command Prompt Version & Copyright in the screenshot, then there must be some other problem. – anilmwr Jun 15 '11 at 7:04
    
@anilmwr could you advise me with some anti-mall-ware programs ? – Nour Sabouny Jun 15 '11 at 7:21

Go to windows directory (c:\windows\system32), find cmd.exe and copy it somewhere (like c:\ or desktop), then rename it to for example cmd2.exe and run it. If it works then you are infected with some kind of malware.

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actually it didn't run, and I managed to read the following message: the system cannot find the text for message number .... in the message file. – Nour Sabouny Jun 14 '11 at 14:20
    
Then don't move the vopy, just create a copy of it with a different name. It is looking for some file in c:\windows\system32 and cannot find it (message texts are inside that file probably) – Xaqron Jun 14 '11 at 20:58
    
I tried that too, but it didn't work . – Nour Sabouny Jun 15 '11 at 7:20

Try one best solution Copy CMD.exe from some other computer and paste it in your computer.

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:) thanks for answer, but I think I already solved the problem. – Nour Sabouny Jun 19 '12 at 16:06

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