I don't know if this is of any help, but I'll toss in my two cents worth as well.
I'm running VMC with a pair of Pinnacle dual DVB-T cards (yes, four simultaneous channels, very greedy, I know!) which are allegedly not VMC compatible. However, there are drivers for them on the Pinnacle website which seem to work fine and I don't get any incompatibility issues from them. Or at least I've not seen anything to suggest that they give me problems.
I'd suggest going to the Pinnacle website (http://www.pinnaclesys.com) and looking for the Vista drivers.