How to uninstall DivX
I am amazed at how many people on forums write in asking for help to uninstall DivX. Many say the same thing, they went to Control Panel/Programs and Features and tried to uninstall only to be told that the program was being used or running somewhere and could not be uninstalled.
First thing to do is to remove it from Firefox addons by clicking on Tools-AddOns-Disable, Chrome users go to Tools-Extensions, IE users, I don't care what you do.
Then open the task manager and click on "Processes" and select anything to do with "DivX" then click on "End Process". Now you should be able to use the Programs and Features or Add and Remove Programs to do a clean uninstall.
The best thing to do is to avoid installing anything to do with this horrible media player, it is not worth the trouble.