HELP!. DivX Codec Not Showing Up In Render Settings In Sony Vegas?

Ok. I downloaded the DivX package with the Codec and i went to render my video in Sony Vegas 7.0 under AVI and i clicked Custom and went to the Video tab. Then i clicked Compression and it didnt show the DivX codec as an option. Please help me!!!


P.S. Im Using Windows Vista 32bit