You guys probably need the proper codecs.
http://download.divx.com/divx/DivXPro511Adware.exe (HAS ADWARE)
If that's not the one, it's probably Xvid that you need.
http://www.filemirrors.com/search.sr...iD_Install.exe
Or, you could eventually wait for it to be on IGN or something, but the quality won't be as good.