installing divx isn't working...help?

[Gisigoogle]

i will try to use divx player to watch a movie online but it won't let me access anything because it say's on the screen where the movie is supposed to play that there is a missing plug-in. when i try to install it from their website, it still say's that there is a missing plug-in. plus, when i try to open up the divx file on my computer, an error message pops up saying that one of the components did not install correctly. what do i do? please help!