New Movies=new Codec?

ive been dling new movies like t3, bad boys 2, tomb raider and such but they dont play on my windows media player, avi previewer or my divx player

is there some new codec i need to dl or new program i need to play it? any help is appreciated thanks guys

Are you sure those aren't fakes?

Use the G-Spot tool that comes with the Codec Pack to find out which codec is used by the movies.

Ones with FourCC code "0" are definately fake.