help my video wont play

hi can u plz help when i try playing this video fantastic4 2005 dvdrip.xvid.AC3.CD1_WAF.avi it ceaps saying u dont have the codec needed to play this file iv dowloaded alot of codecs dont know if there the right ones but it still wont play same thing ceap happening.

plz help if u can

www.videolan.org/vlc/

have u tried the coreplayer ??