I have a Genie TV Capture Card and when I try to look at TV on the PC with this Card, it will not show the picture if I select overlay mode - just a still pic that seems to look good quality. BUT when I select preview, it shows the live video in bad, blocky quality.

How can I get it to show the live video in good quality or possibly in overlay mode??

Note that I have a 1Ghz Athlon T-Bird Classic 266FSB with a Riva TNT2 M64 32Mb Card and the latest Detonator Drivers.
I am running the TV Tuner/Video Capture card at 320x240 - YUV12.

Plz Help!