How important is quality in the end result-
This is a PC not Mac right?
You can use DVD shrink, if it is a retail dubbing you are trying to compress, and you will have some quality loss, but nothing earth shattering.
Are you familiar with magic dvd ripper? if you have this software, feel like trading for it or buying it, I have used it before. here is a very nice walk through - images included.
http://www.magicdvdripper.com/compress-dvd.htm
The software is about 50$ you may not want to spend that - if this is a one time only thing you need to do- but it is a good program
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Homer