This unit doesn't allow you to record "Data" to a disk from a PC in digital format, unless you can figure out how to stream video through the ilink/firewire connection. The audio will still be via analogue though ... no 5.1 audio if that's what you are thinking
As stated above, if your video card allows you output video, then you can record home-movies & etc using it's standard recording features through the analogue connections.
Also as stated above, it is much easier to install a cheap dvd writer into the PC & work with the video directly on the PC, and burn to a DVDR on the PC, which will provide much better quality results than transferring anything via an analogue connection anyway.
It will also be a hell of alot faster than playing to the standalone recorder & recording everything in "Real-Time".