You need a cable which has on one end, a scart connection, which plugs into the video recorder and on the other three separate jacks. One of the jacks, the yellow one, plugs into the video socket at the back of the PC. The other two white and red ones plug into the audio socket e.g your microphone socket or line-in. To do this on my PC I had to get an adapter so that the red and white audio jacks plugged into one socket.
Here's something similar
http://www.maplin.co.uk/Module.aspx?...ges&doy=search