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My virus checker picked up a trojan in the two copies of cmd.exe and they have been deleted. I now get this pop-up:

Windows File Protection

Files that are required for Windows to run properly have been replaced 
by unrecognized versions. To maintian system stability, Windows must 
restore the original versions of these files.

Insert your Windows XP Professional Service Pack 2 CD now.

I probably lost this CD 10 years ago. I've found a bunch of copies of cmd.exe online and tried them, but they all vary widely in size and the pop-up comes straight back after dismissing it even after these replacements have been made. Can I somehow find out which version it's looking for and is there any way to obtain it once I do?

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You shouldn't really download that kind of stuff from the Internet – Ashtray Jul 19 '13 at 6:17
I don't presently have any other option. – GaryG Jul 19 '13 at 6:27
Ask your friends, maybe they have the CD and do a computer repair from the CD. That IS your best option, I guess. Otherwise you'll end up getting more crap and ruin that completely. Also, did you try System Restore, don't know if that would work? – Ashtray Jul 19 '13 at 6:32
Thanks for the advice, I was intending to ask for a CD, but since the internet exists and is a potentially more immediate solution I would still like to hear other suggestions. – GaryG Jul 19 '13 at 7:06

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