windows xp media center

I have windows xp media center, I had a problem and had to reload the program. After reloading the program evry time I try my TV I get an error mesage that some files are missing. When I tried to use the widows disc to repair the problem it tells me that the version I have is newer then what is on the disc and it will not do the repair. It will let me reload windows which requires me to reload all the dell software.What can I do to fix my problem