Check and see if the device is even working properly using Device Manager. What happened before the sound stopped working? Are the drivers updated? Is it possible your sound card is no longer functioning (as in, not just a driver issue)?
Ummm, I do remember re-initianing my computer after I installed automatic actualizations...after that, I couldn't play anything on winamp or even watch a video with sound. My speakers are ok; how do I know if my soundcard doesn't work anymore? thank you so much for replying