Forgot to ask what operating system you were running too, b/c if you're trying to run DOS TIE on Win2K or XP, it won't work, since neither of those operating systems supports DOS applications natively. This means you have to run TIE under an emulator of some sort, such as VDMSound (
http://sourceforge.net/projects/vdmsound), which has been found to work with DOS X-Wing and TIE Fighter. However, since DOS games run under an emulator tend to run slowly (and often to the point of being unplayable), I recommend finding a copy of the above-mentioned X-Wing Collector Series or X-Wing Trilogy. X-Wing and TIE from those bundles will run on Windows XP without much trouble, save for needing a compatibility fix found on LucasFiles (
http://www.lucasfiles.com) in order to run with hardware 3D acceleration enabled.