Having Realtek audio problems myself as well on 10159. I tried three drivers including the one from WU and whenever I set it to 5.1 the driver stops working and I have to uninstall it. Only stereo works. Any ideas??
i try over 100 times check windows update for x86 couple hours nothing ...some times its like they stuck and can't see the builds this happened in build 10158 and 10159 maybe is error of microsoft only....
Having broken audio with my Audigy sound car as well. Weirdly enough, the Realtek is working. It's related to the audio rate. Experiment a bit with the rates and you'll get the sound again... hopefully!
I did ask them about start menus from xp/7 hint i think they added more features on this build i would expect more as it taken around 6 days for them to look at the feedback then added it