Vista Tutorial - Media Center with 64bit Os

Hey guys, Just to give you a bit of background I had an acer computer with a 32bit OS running with my WinTV-HVR-1800 and everything was working fine. I could record shows, stream to my xbox360 with ease. I've decided to upgade my computer to a Hp A6648F Running with a 64bit OS..Other then that no there changes have bin made besides beefing up the processor. The media center still works ok I can stream to the xbox and watch cable. But if i set up a recording or go through the automatic setup for the tuner it will not work. This is a small but another annoying problem I seem to be running into with upgrading to a 64bit os. Hoping this is something I'm just looking over and not another thing that makes me think that I'm being peanalized for upgrading to another Microsoft Product that claims to be "superior"

Thing's I've tried:

Re-installing tuner
Windows updates
Re-installed Media center
Placed the card into another slot
Running the program as admin
Restoring the computer factory settings

Thanks Guys