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cmd causes exploer to crash

When logging to the computer my login script (login.cmd) causes explorer to crash. I also tried to type cmd into the run command and it did not work. I tried command in the run command and that worked. I think we are looking at some type of virus but I don't know what it is. I have been search google for days and I can't come up with anything.

Windows XP Pro (infected computer)
Window Server 2003
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1 Solution
had you try to download combofix:

Have you checked Event Viewer on this system?
You might also try running malwarebytes
No matter which suite/suites you choose to run I suggest that you boot into Safe Mode and run them there.
You might also try running SFC /SCANNOW.
SFC SCANNOW takes about fifteen minutes and requires your OS CD.
If the problem is only under one log in the user profile could possibly be corrupt.
To test, log in as a different user. If the problem does not persist chances are the profile is bad. In that case, you may need to recreate the profile of the user that is experiencing the issue.
Also having the same issue - we can run cmd do "run as" and select current user and check the check the box under it that says prevent other programs from using and it works just fine - if it runs normal it crashes explorer.  I will bookmark this and if we fix it will post what worked for us.  
RESOLUTION: This fixed it for us

New Reg key to learn and a virus without a def is the basics - check out this post.
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