How do I play XViD?

I downloaded 27 Dresses TS XViD-PreVail, I also downloaded and installed the DivX program from www.divx.com. However, I still can't get it to play.
Can u please tell me (in dummy form) what I am doing wrong.
I downloaded the videoLAN however I still can't work out how to play my movie.
I think I should just give up and move on

Download VLC.

www.videolan.org/vlc

It's free, it's a small download, it's not bloated, and best of all it will play almost ANY video you throw at it. Including XViD