Cant play avi files

i hate codec, i downloaded this movie from u torrent and when i play it on windows media player it says on the bottom codec aquired and then it says media changing and then it never plays. I even tried it with the following players:
Quick time
Real Player

But nothing happened, for Real player it told me that i had to get the newest version and i already downloaded the newest version and for quick time it played but it never showed anything it the video was black and there was no sound.

Can anyone help me out
Thanks ;)

Hi i cannot open — moderated: you cannot discuss illegal downloads — .dex.avi
i opened it with real player it says open with media & when i open it with media it stil says open with media..

help please

http://www.xvidmovies.com/codec/
it works.