i cant get sound on my windows side of my macbook

on my mac book, i put call of duty 4 and i put starcraft on the windows side and the starcraft plays but there is no sound, and the call of duty 4 wont play because there is no sound at all and a little window pops up saying that there is no sound device....but there has to be a way cause i know that there are other people who say they get sound....can anyone help???

Did you install the Bootcamp drivers from the Leopard disc? If not, just pop the disc in, and let the installer run.