HELP--can't view video downloads

[4mush1n]

I have Windows XP. I've downloaded two videos from Limewire and cannot view them.

When I try to view "The Incredibles Full...avi" on windows media 10 I get a message that reads "Windows Media Player cannot play the file. One or more Codecs required to play the file could not be found."

When I try to view "American Beauty [DVDrip, Divx] (again on wmp 10) I hear it, but can't see it. While queing it up the wmp trailer says something @ an error, but it moves so fast its unreadable.

Thanks for your help!