1. Make sure that the sound voume in the Options menu isn't somehow being set to 0 in the game.
2. Press Alt-Tab while in the game, then open the Volume Control Panel. Make sure that both the Maain and Wave Volume Controls are on.
Very basic, but I don't see any other possible solution.
zyxomma100-
Age of Kings Heaven forumer
Proudly thwarting Dark_Aro's evil plans since 2002
"There is nothing more sad than watching a teutonic knight chasing a petard."