This Link will help you out.
Requriments: A capture card, a card with video-in or tv-in. PicVideo MJPEG Codec or best quality Huffyuv codec and VirtualDub.
Install PicVideo first Or install the Huffyuv codec for the best quality but requires lots of hd-space, download the pre built-dll and exctract the zip and rightclick on the .inf-file and select Install.
Rest of instructions are on that site. Hope that helps. Here is another link also.
http://www.dvdrhelp.com/capture. It has various ways of capturing video.