I just upgraded from windows 8.1 (fully patched) using the wipe existing data and apps option during the install and everything seems fine but my system will not sleep. So my battery is dead within a few hours. After doing a powerfg /requests I see my audio card has a steam open that will not close. This happens with both the default windows hd audio driver and the win 10 drivers from the realtek website (8.1 drivers from ms refuse to install). So far I have tried turning off Cortana and it makes no difference.