No TV tuner drivers or video file after my MediaCenter 2005 Upgrade???

It appears that everything else works fine after the Media center 2005 upgrade. My only problem is that my tv tuner and video files are not coming up to play. Im not sure why this is. I have windows xp and had the dvd uprgade disk. Microsoft told me I was not under warranty, which I knew, but I assumed since I bought the disk from them, they would help. No luck at all. So here I am hoping to get some help within these walls of knowledge. It would be greatly appreciated if I could get some help. Its been about a month since I have no Tv in effect.

Thanks...................