mplayer/mencoder NOT media encoder
go here:
http://www.mplayerhq.hu/design7/dload.html
unzip mplayer
download the windows version and the essential codec package
unzip the codec package into the codec directory inside the mplayer folder
its commandline only, so put the mplayer folder on your desktop and then put the movies you wanna change inside that
then open command prompt and type this:
cd Desktop\mplayer
mencoder <insert_movie_file_here> -o <put_movie_out_title_here> -oac mp3lame -ovc lavc -lavcopts vcodec=mpeg4:vqmin=2:vbitrate=2150
^^^above command is all one long line
that will convert it to mpeg4(divx), or you can do xvid by replacing the -ovc lavc blah blah part with:
-ovc xvid -xvidopts vbitrate=2150------may have to check the docs here, the xvid options are a bit different
if that doesnt work im sure what you can do that doesnt involve separating the audio first and converting them to mpeg's, quicktime isnt an often encountered format cept on macs
what formats will windows movie maker deal with?