it pops up when i go to play video on divx it first said to download a ac3 so i did now its saying i need a dibx directshow audio format pack. i cant find it online anyone know where i can download one for free?
I highly doubt an error message told you to "download a ac3". You can encode or decode AC3 audio, but you cannot "download a ac3".
Get latest version of ffdshow-tryouts: http://ffdshow-tryout.sourceforge.net/ and use any DirectShow media player, such as MPC-HC: http://mpc-hc.sourceforge.net