You would prob. need some hardware such as a video capture device (you can get cheap USB ones from about $100 that should do the job) - assuming that you wish to capture from an analogue source such as VHS etc.
Some digital cam corders enable you to dump recorded footage via firewire to your hard disc and then you can use Microsoft movie maker (free with xp) to get screen shots. (Some of digital camers enable you to pass the analouge source straight though - others require you to record it to digital tape first...) (NOTE: If the source has macrovision you may need to do some extra steps....)
Or - get a professional to dump the source to DVD then you can use your dvd player software in your computer to capture the footage for you.
Failing that pm me and I am sure we could work something out...for a fee (just kidding...about the fee...not the PM :wink: )