I just purchased a "refurbished" Dell Optiplex GX 620. When I turned it on everything worked fine until it rebooted after an automatic Microsoft update was installed. Now I have no sounds. According to the Device Manager "Your sound card is not working properly because a compatible driver is not available for this version of Windows." (I'm running Win7). My sound card is a SoundMAX Integrated Digital Audio. I have tried several SoundMAX drivers (found online) that said they were compatible but they don't work either. Can someone please help me out?