I tried exactly the process you suggested and but unfortunately it did not work for me. However, as you suggested, the driver I have installed is the Microsoft driver! The Realtek driver did NOT work and that is why I Cancelled the Install part of the Realtek process.
What I think is happening, at least in my case, is that Realtek's Uninstall process works whereas when I clicked on Device Manager, Update driver, or Uninstall, the sound still would not work. At least in my case, what finally worked, is to let Realtek, rather than Device Manager, do the Uninstall and then let Windows install the driver.
Device Manager always has listed the same driver number no matter what I tried. However, by going to Search Dxdiag, I could see Realtek or Microsoft driver numbers. Interestingly, the driver number shown when the sound finally worked was what I stated in my write up but dated one day later at 7/10/15
I have no knowledge whether the Microsoft drivers are any better than Realtek. Another respondent addressed this.
You may want to try downloading the new August 10 WIndows Update for Realtek drivers. I tried it and it did NOT WORK for me. I had to got through the Realtek uninstall process again.
After cancelling the Realtek install and rebooting, I had the Windows startup sound immediately. The driver is a Microsoft driver with the same driver number as shown. If I enabled Windows update and allowed the driver to download, it DOES NOT WORK. I tried this process both with the original Windows 10 release and the August 20 Realtek driver update.
The only thing I can surmise is that the WIndows update is both uninstalling and reinstalling their driver and for me and that DOES NOT WORK. The only way I can get sound is to use Realtek to Uninstall, then let Windows reinstall the Microsoft driver still resident on the computer, NOT from Windows update.
I think the problem, at least in my case, is that both the original WIndows 10 release and the August 10 WIndows Realtek driver update do not have the proper uninstall process, so I have to rely on Realtek for the uninstall.
On August 13, I received the following helpful message from a Microsoft Senior Software Engineer so maybe a fix is at hand:
"I think you're on the right track with this. We're working on a fix with Realtek. Thanks for the data!"
I had this problem. I just went into the device manager and updated the Realtek driver. It worked.
Got a similar problem with my laptop.. Clevo something..
I got no sound from my headphones. Its recognized when plugged in but no sound.
I have to turn off the laptop or reboot many times, then it works. And after the laptop has been idle same thing happens.
Uninstall drivers etc fix the problem until next time i reboot. Then its the same problem again..
Speakers works only headphones that doesnt..
Another set of crappy Realtek drivers were pushed to me using Windows update. I hid them using the tool but I was still forced to install them first. They are a bit better but still suck. The audio is no longer super loud but it still makes my Bose speakers sound like a cheap $9 no name brand speakers. No bass and tiny sound. I uninstalled them and they have not shown up in Windows update until the next crappy Realtek driver update.
What really gets me is that it leaves all my other drivers alone. I updated them manually and they stay on that version but it will not leave me alone on the audio driver. Come on 90% of my computer use is listening to music.
Same problem on a Lenovo desktop. Asked for Microsoft support and even entered my password on one of their screens and gave them control of my computer! Believe me, I AM USUALLY SMARTER THAN THIS. They futzed around and gave up...disconnected without saying anything. I then changed my password. They had no idea what they were doing. It sure seems that the problem is an incompatibility with Realtek drivers and Windows 10....why M$ did not suspect this %$*!!! I went back to Windows 8.1.
If someone knows when a Realtek driver is available, please post. I'll try Windows 10 again although the idea that a window title bar must be white only is absurd!