It's been a while. I guess I never kept you updated, but I eventually was able to get rid of RealTek and use the generic Windows audio driver, which worked fine. However, I started having problems after that. Here's a message I've posted on answers.microsoft:
I have a Dell Inspiron 15 7577 that I bought in Japan. Last summer, I deleted the RealTek Audio Driver that came with it so that I could use the default "High Definition Audio". This worked fine, but when there was a big update in January to Windows 10, I lost all speaker and headphone functionality.
The "High Definition Audio Device" still appears in the Device Manager, but updating the drive does nothing. The volume icon in the Task Manager shows an X and right-clicking on it to open Settings shows no available output or input devices. Opening the troubleshooter and the only devices that are displayed are currently inactive Bluetooth speakers/headphones and "Digital Audio (HDMI) - High Definition Audio Device". So maybe the "High Definition Audio Device" in the Device Manager is referring to HDMI sound as well and not the computer's soundcard?
I didn't have any luck updating or installing drivers, so I tried a System Restore (Restore to Original Settings), but upon reboot, I got a message that an error was encountered while trying to restore- but no details. What should I do?
I've just been dealing with it the last few months by using an external audio interface or bluetooth devices, but it's pretty silly and I'd like to fix it. Any ideas?