many systems have several sound sources, when you update the driver of the one you are using, the old driver is removed and at that time windows may make another driver the default sound source. When you install the new driver you will want to make that the default sound source.
you might want to got into control panel (windows key+ x, then type P), select hardware and sound, select device manager, look on the list and find sound, video and game controllers. And disable any sound sources you never use.
for example I disable AMD high Definition Audio Device ( this is sound support via the graphics card that goes out my HDMI or Display port cable, and I don't have any speakers in my monitor)
you then want to select control panel->hardware and sound-> manage audio devices
it should show you a list of audio sources on your machine, select the one you want, configure it and set it as the default.
you can also do this by right clicking the speaker icon on the lower right of the screen (next to the time and date)
on the task bar, and select playback device and change your defaults. (i do this sometimes when I change from main speakers to headphones and the program I am using does not keep its configuration correctly, and just uses the default audio device)