Help i need an decompressor

Hello,
i downloaded finding nemo.
but when i want to play it in winhamp, media player or realone player it say’s the same in all 3: cant downlaod the right decompressor.
i have no idea what i need now to play this movie who can help me?
thnx already!!
Lizzy

try either of these two players

media player classic

vlc player

both free to download

If you can help you should help