I can't play a movie file I've downloaded - missing codec?

I’ve downloaded from Kazaa a .avi file of the movie Eternal Sunshine of the Spotless Mind. Every media player i have in my pc delivers an error message, except for windows media player, that plays the file just like a regular mp3 (with the visual effects that wriggle with the drums in songs).

Is the file corrupted? Do I need a codec? And if so, which one do I need?

Thanks,

Rui

cook codec