Vista HP64 doesn't find sound or TV cards

I have a clean install of Vista Home Premium 64bit version that doesn't seem
to recognize anything in my PCI slots. I'm trying to install a Soundblaster
x-fi extreme, and a theatre 550 pro tv card. For the tv card, after install
of downloaded drivers for Vista 64, I get no further than media center
stating no tv device detected. For the sound card... under manage audia
devices, no audio device installed; during driver install, no supported
device detected. I've tried removing then replacing the cards, no change,
also no "new hardware found" message. What I have also tried is swapping out
the HD and loading XP; it finds everything just fine (those little yellow
questionmarks for device is here but no driver installed). Hope this wasn't
too long.