I have a win98/xp dual boot computer with onboard via ac'97 sound. the sound stopped working in the xp portion only after working for 9 months. I checked devices and all are fine. The audio setup in control panel does not show a sound card existing. I tried uninstalling and xp detects the sound card without a problem. I tried original system drivers as well as updated drivers with no success. I also stopped all non critical services, but audio control still says there is no sound card. Any ideas?