I've been running WMC on Win7 Ultimate 64 bit with a Ceton PCIe card(w/Comcast) with two xbox extenders for about a year. It's about 95% reliable.
I'm getting FIOS service today. I think I will just need to re-run the TV setup wizard after I insert the new FIOS cable card and I should be back in business. Anybody make a cable card change like this before? Should it be this simple? Any lessons learned?