Divx to mp4

I was wondering what free programs (not bs free trials) or online sites that convert divx to mp4 video. im wanting to put some of my videos on my zune 30gig and seem to me having some problems doing so. anything would be helpful. im not a big fan of divx i like my mp4s. ive been using nero 7 and it doesnt like divx

have you tried Super?

yes much much help