Hello! Thanks for your help, but I've went through the checklist and nothing's helped; It's not a sound controller that's the problem, but rather a System Device.
Just had this issue crop up on a brand spanking new msi ge73 laptop after upgrading from 1803 to 1809. Have installed and uninstalled the latest nahimic and realtek drivers from msi multiple times, but for some reason this device is being listed as a system device and not a sound device. Because of this, the driver install process is not recognizing the proper drivers. And to make things worse, M$, in their infinite wisdom, removed the hardware troubleshooter from 1809, because analytics showed it was the least used troubleshooter. I call bs on that decision. If the troubleshooter was still present, it might, just might, be able to help solve the issue.