Stoik video converter...or something like that. I have the zip at home. It's a free converter, very basic, but does the job quite well. You can convert most anything(I'm pretty sure .mov's included) to AVI, WMV, and I beleive mpegs.
If not, tmpeg, or something like that ;P It converts JUST to mpeg, but I can't recall if it'll use a .mov file or not...
And you say MPG, do you mean MPEG1 or MPEG2?