Record video stream to tv tuner card?

[yort]

I've been trying to record a video stream with a few screen capture programs but the video is choppy due to the fact that I don't have a dual core computer, however I do have an Xtreme TV Tuner Card (PVR550) that has it's own MPEG processor and is capable of recording TV in very good quality. I would like to send the video stream directly to my tuner card. I've tried several things already like connecting my S-video-out on my video card to the composite-in on my tuner card but the video is blurry and not good quality. Is there a way via software to send the video stream internally to the tuner card?