It could be disabled. By default that listing doesn't show disabled devices. If you right-click within the list of recording devices, one of the options shown should be "Show disabled devices". If it appears, you can then right-click it and enable it.
Thanks for getting back, I did has you suggested by right clicking. You can see there are only two disabled devices. If memory serves me right Stereo Mix should be under Line In, which it isn't.
On October 08, 2019, 2x3i5x posted
First thing I would do is to get and install the latest drivers available for your audio card/device & operating system. Looks like your computer just has the generic drivers provided by Microsoft.
If your device supports Stereo Mix and it's not showing up, that may be a reason.
On October 09, 2019, I replied.
I downloaded the audio driver went to install it, during the installation I received a report "Install Realtech Audio Driver Failure"
Perhaps I downloaded the wrong driver. My motherboard is
ALiveNF6P-VSTA
Bus Clock: 200 megahertz
BIOS: American Megatrends Inc. P1.50 04/09/2008
I have audio, but I don't have anyway of recording. I get these two reports when I use Audacity top and Wavepad.
This is really getting me down - Thanks for any additional help.