Right click on the speaker at the bottom Right of your screen..
-- Click on the Recording Devices
A window Titled Sound will open
if there is no contents in the Sound window, Right Click
inside that window and then click on "Show Disabled Devices " ...
any able-abled device mic/aux/Stereo Mix will then show up..
To enable one or the other Right click on the Stereo Mix and click on Enable ,
Right click on the device again, and Select "Set as Default Device "
if you do not see anything you have not installed the drivers correctly
Uninstall drivers, restart Windows then attempt to install the drivers again..
You can also, double click on the Mic/Stereo Mix (after enabled)..
a window will pop up...
Click on the tab "Levels " in the Stereo Mix to unmute your Mic or to adjust the sound..