Logitech HD Pro Webcam C920

While logged in with admin permissions:

plug in the webcam, you'll see the speakers disable and you have no sound

open services 'as administrator'

go to windows audio and double click it to open

go to the login tab

switch it to log on as Local System account radio button at the top, hit apply

restart the windows audio service

now you have the right icon but still no sound

go to Windows Settings > Sound

scroll down to input devices, find your webcam and select it

scroll to the sound enhancements section and turn it off

close the settings window

go back to services

open the windows audio service again

go to the login tab

select This account

click browse

click advanced at the bottom

click find now on the right

select the LOCAL SERVICE account, click ok

The password fields need to be blank.. delete the ******** entries

click apply

restart the windows audio service

Sound is back and working

This was all done with a Logitech C920 webcam.

So far this change has stayed in place with no issues.. I haven't tested to see what happens if I connect a different type of webcam or if a future Windows update will break it again.