I have a Compaq NX9005. I had it on Windows XP and the sound worked fine, but I've upgraded to Windows 7 and it now says that I don't have an audio output device installed, so I have no sound! Now I know it works, but have no idea how to get it going again. I've tried downloading the updated drivers, but it says I have the best ones installed now (but I still tried), I've tried codecs and all sorts... is there some way to get Windows 7 to realize that I *do* have an audio output device installed, and to make my sound work again?