Joining (and fixing?) mpegs

Had some mpegs that had been split from a bit mpeg and couldn't seem to fix them or merge them with anything - virtualdub complained about incorrect video and audio.
I use mpg joiner to merge them which seemed to fix the problems as well.

http://www.321slideshow.com/mpg-joiner.htm

Install it in a v-m with undo disks tho', it has a 30 day trial period. Or buy of course....