Main menu:
Download the driver from dell and save it to your desktop.
Then, right click on the installer,
choose Properties.
I have my UAC disabled so for users with UAC on, you might have to allow access or press OK.
Navigate to the compatibility tab.
You should see a list of OS-es at the dropdown menu.
Tick the “run this program in compatibility mode”.
Choose Windows XP (SP2), press Apply, and OK.
Now, double click on it, and it shall load. Install it, and you’re done.
For some users it’s worth a try to restart if you still cannot see it.
After you installed it, go back to your volume mixer,
Choose recording tab, check the Recording Tab.
If you ticked “Show Disabled Devices” and “Show Disconnected Devices“, you should be able to see the Stereo Mix shown elegantly inside. Now right click on it, and enable it.