there are numbers of free media players like VLC, MPlayer, and Gom Player...

since i'm a Gom user.. i strongly recommend you Gom Player.. it playbacks most of the AVI files..
you can download them at

http://www.download.com/Gom-Player/3...ml?tag=lst-0-1


(well.. i found out about Gom yesterday.. and i really loved it..)