I did as you suggested - same thing. I needed to upgrade the drivers anyway. Windows told me to apparently
I am just guessing DVB-Viewer doesn't like the new theme or isn't compatible with it. VLC Player seems to be fine as well.
I've turned Aero off anyway, hate it.
But was really seeing how I had Aero on and DVB-Viewr using the basic theme.
Thanks for the suggestion though. I'll probably muck around with it again on the weekend to see if i can fix the issue, maybe actually update DVB Viewer as well.