Go to Start... Run... and type "regedit".
In the left hand pane, click on "My Computer" at the very top, and then do a search by hitting F3. Type in cmd32.exe and delete every reference to it in the right hand pane. Beware that editin your registry in this way is risky and if you're not sure about what you're doing you might want to just stick with the problem. However, it's not difficult to understand what the keys might do or mean, and therefore infer what the effect of deleting them might be. Good luck