also several if not all Video card driver do install HDMI audio devices
right click on your speaker icon and select play back devices and Disable the ones your not using
select the one you are using right click it select properties
select advanced
set the default format to 16 bit 48000 Hz DVD quality
i use an old SB live card and set my speakers to 2.1 audio there too (5.1 also works fine goin thru my HDTV's sound system if i use the Nvidia HDMI audio and connect my tv via HDMI )
sound also works fine on both my laptop that has a sigmatel audio device with Dolby digital Plus installed
just had to get updated Windows 10 drivers from my laptop maker (lenovo)
if you have a realtek audio device .. good luck ! i disabled mine as it sounded horrible compared to an old SB live card
try to find updated drivers here realtek keeps updating them ... as they have had problems i guess with windows 10
http://www.tenforums.com/drivers-har...r-version.html