My Acer Switch 10 no longer plays audio after the upgrade to the anniversary edition of Windows 10. During the first update, a number of updates are installed, including the graphics driver and the sound driver. I can change the volume just fine to the point where when I press the button, it shows the percentage on the screen and a graph going up or down but no audio is heard coming through the speakers. It was working before the update but is not now. What can be done.