Well, to start, that's not a Media Center- approved tuner (read: no hardware encoder, no MCe2k5 or Vista drivers, etc.)
Can you still return the card? If so, that would be best, and then get yourself a 'proper' tuner (w/ hardware encoder.)
~Chris
'nearly every day of my life is some kind of computer hell'
Desktop: E7300 on GA-P31, 2GB, HVR-1250, HVR-2250, ATI DCT (internal), HD4650, Win7 Pro x86.
Server: Intel E6400, GA-965G, 4GB, 2x 500GB WD, 2x NV DualTV, 3xHDHR (2 QAM, 1 ATSC), HD3650; 2x Xbox360; Win7 Ultimate x64