16 days old, if this is a necro, I'm sorry.
On my old machine I uninstalled the nvidia drivers so I could use an extra AMD card I have. Of course, the nvidia hdaudio driver did not actually uninstall and conflicts with the AMD hdaudio driver. I remembered the name "driver sweeper" from the old days and see that it's called DDU now.
Should I give it a go? This other machine still runs Win7, so I hope I wouldn't run into an issue like the one above.