Do I need a video card to record?

[BlahBrah]

Hi, I've got Dish Network Sattelite with its PVR thing(like TiVo I guess, it records programs) and I was wondering how I could go about recording the stuff I have on PVR onto the computer. Do I need a special video card for this? Also, on the back of the reciever there is an S-Video plug, if that helps. Thanks