[Yozzer]

Hi, this is my first post so be gentle please.
I installed the SP1 update for Vista, but found I could no longer use the media center, it kept saying the digital tv card could not be found, (it worked fine before the update). I have tried putting the drivers back in, and eventually removed the SP1 update but it is still the same. I have an AverMedia DB-T 777 which has previously worked fine, and still does on XP, (I have a dual boot).
My question is can I repair the installation in some way, or will I need a fresh install to put it right, (I hope I do not have to do this and have to reinstall all my programs).
thanks in advance.