system32\cmd.exe error please help!

[apb540]

This is the pop up that i recieve about every 8 seconds

C:\WINDOWS\system32\cmd.exe
The NTVDM CPU has encountered an illegal instruction.
CS:0537 IP:ffe0 OP:fe ff 1e 09 ae Choose 'Close' to terminate the application.
It then asks me to 'Close' or 'Ignore'

I have no idea how to fix this problem because I am not very good with computer trouble shooting. If anyone knows how to fix this, please tell me.

Thank you

[first]

Go to: Start-> Run and type cmd

you will get a DOS WINDOW.wat is written in its top blue part

[apb540]

in the top blue part it says:
C:\WINDOWS\system32\cmd.exe

[first]

Make sure that you View all HIDDEN files in explorer (Folder options/view settings)

- See in C:\windows\system32 if you have the files cmd.com and regedit.com

- the original files from Windows are cmd.exe and regedit.exe not .com

- delete cmd.com and regedit.com files as they are not required

- make sure that you have the .exe files.
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there is a chance of virus infection.so use a popular "updated" antivirus.if this dont help
try using the hijackthis log as mentioned here http://www.techsupportforum.com/secu...sting-log.html