Thanks for the replies.
As it was I took the long way around and continued to convert them with Auto GK.
For these that are interested I had 16 VOBs in total, 4 DVDs with 4 VOBs each, so I used DVD shrink to save each DVD into a single VOB, and then used Auto GK to convert them to 4 AVI files.
It took about an hour to do each file but it worked in the end.
Joseph: Thanks, but the link times out for me.
Ann: Thanks for the tip.