You may also want to find out what kind of sound card it is and download most current drivers from manufacturers web site. It's also possible that your game, assuming you just installed it, overwrote the original sound drivers with it's own. Check the web site of the game as well as they may have a patch. Also, if it's a brand new machine, if you haven't already done so, do a windows update since most new machines are a month or two behind on MS updates before they leave the factory.