/earlier post
simply put: AWESOME. for viewing divx, the best program is bsplayer (in the windows world, anyway). there is little debate in the xvid / divx expert circles.
it comes neatly packaged with all the codecs at:
http://www.kazaalite.tk/
getting the "codec pak" and installing it (which also installs bsplayer, by default) is the simplest easiest way to watch divx on a machine that does not currently have divx capability.
also very good on that site are real and quicktime alternatives, in case you don't want HUGE MEMORY HOG BLOATWARE on your nice clean XP installation.
/end double post
this is THE DEFACTO divx player and codecs.
WMP sucks, as do real player and the others.