I've been using the TBS6280 for a while now with Windows7, but there seems to be problem with the tuner under MCE.
The problem appears in 2 ways, and seems like it could be down to a common issue.
1 - When watching live TV, and changing the channel, it will sometimes complain of no signal. If you then pick another channel it will work, and you can then change it back to the channel you tried earlier and it will work OK.
2 - When MCE is about to start recording something that has been scheduled, it will pop up a warning saying it's unable to make the recording as there is no signal. When checking the recordings, they are there, so I guess it must re-try.
I'm running under 64bit windows 7 home premium on an i7 with 6Gb of memory. I'm using the driver that can with the card, V1.0.0.3.
--- jjj