Media Center - won't recognize HDTV or make it past channel 185

I've been having a little trouble getting my Pinnacle HDTV card to work on W7 7100 and now finally got it, though it won't go past channel 185. I'm using a straight-from-the-wall coax, so no cable box. Pinnacle's TVCenter program worked fine in XP and displayed channels 200+, which were local HDTV channels, though Media Center says it can't go up that high when manually entering in the channels. So I'm not sure if the driver for the card doesn't mesh well with W7 and can't recognize HD channels, or if it's MC just not able to go up high enough channel-wise.

Any ideas?

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