Yeah, follow the instructions in this tutorial
. Make sure you remove any codec packs you may have, as well as desktop versions of divx, (you can reinstall them later if you want) and pay particular attention to the registry cleaning part.
Also, whenever anything goes wrong, the first thing you should do is clear your caches and delete all your cookies:
Clear all cookies and browser cache (in Firefox) by selecting the clear recent history function. Be sure all applicable entries are checked (under the details tab), and be sure to select "everything" at the top. Then clear your divx download cache (right-click in player window, select preferences, download cache, and clear it). Restart your browser.
Please interpret the instructions for your browser (if it's not firefox). In chrome it's called clearing "all saved data." Try hitting [ctl,shift,del] then clearing EVERYTHING. The instructions for the divx webplayer are the same.