I uninstalled all my nVidia drivers, but there is a driver in my device manager under the sound part called 'Legacy Audio Drivers' that I can't seem to uninstall no matter what I try. At any rate, with all of the nVidia drivers uninstalled, I uninstalled and re-installed the RealTek drivers. Still no luck. However, I did notice that while both the nVidia and RealTek drivers were unstalled, the systerm sounds were at least working. However, those quit working again when I did the re-install for RealTek