You might want to consider downloading the latest XviD (nic`s should be okay), since I think your version could be outdated and then it won`t work properly anymore.
And never install a pack with codecs (nimo? tsunami?), always install codecs yourself. A pack usually makes sure that there will be errors.
Best thing to do is to go to
http://www.divx-digest.com and check for softwarecodecs DivX 3.11, XviD (koeppi or nic, just check which is the newest) and a ffdshow. Although you might want to consider grabbing divx 5.xx as well. Install those after you`ve uninstalled the pack, that should help.