CMD run problems

Ok every time I try to run cmd I get an error, and it closes.

The error is as follows:

c:\WINDOWS\sytem32\cmd.com
C:\WINDOWS\SYSTEM32\AUTOEXE.NT. The system file is not suitable for running MS-DOS and Microsoft Windows applications. Choose 'Close' to terminate the application


Does anyone know how I can fix this? I'm running sp2.

edit. it only does this if I click run then type cmd, the shortcut in the start menu works.

 

Click Here and in the page that opens, scroll down to and click on "XPFix.exe" to download the file.

Once downloaded, just run it. It usually solves the 16-bit subsystem error.