nVidia Composite Input?

Hi everybody. I bought a geforce 6600GT a while back and in the package had came a cable with multiple inputs and outputs. First I tried connecting it to my hdtv with the component cables then I tried connecting my pc to my standard tv with s-video. Then I tried the inputs but can't figure how to see the video on my pc. My package came with no extra program but drivers and media players. The media players couldn't display the composite input I wanted. My card is nVidia from eVGA. I checked it's website for composite input but found nothing. Even nVidia's own website and they only said tv-output. Can someone please tell me how I can view tv on my pc through my composite input.