I dont get any sound in divx player on my 6600

Hi evryone.I'm facing this big problem on nokia 6600.I hav installed divX player v 0.85 but i cant hear any sound.I have chkd it on another 6600.Bt its same.Can anyone pls give me a sollution?Nd i also wana knw if there r any software 2play .mp4 format files on 6600