DivX Latest=Bloatware. I would recommend staying away from the later versions for basic playback.
Now, this may be
WAY off the mark but I wonder if DivX DO NOT want to playback other formats, especially as its main rival also happens to be freeware.
If you have a previous image, I would go back to before you installed it (or use System Restore) & start again.
But if you love Divx & for further info, check out the master site for compressed video
http://forum.doom9.org/forumdisplay.php?f=56
pretty good advice.
PS.
it also does XVid 