Sound driver not working and not able to update after the Windows 10 1803 update.
The RealTek driver installation failed error code -0001 error, or a 0x0000374 error.
So for solution need to install the generic audio driver from Microsoft.
Steps to do this in Windows 10:
1. Open the device manager
2. Find the Realtek HD Audio Controller (may be listed as an unknown device). It will likely have a yellow triangle next to it.
3. Right-click on the device and select "Update Driver"
4. Select "Browser my computer for driver software"
5. Select "Let me pick from a list of available drivers on my computer"
6. In the next window, you may be prompted for the TYPE of device. If you are, select "Sound, video and game controllers"
7. Ignore any RealTek drivers and select "High Definition Audio Device" and click NEXT.
This will install the generic Microsoft audio drivers, which seem to work after the 1803 and 1809 updates.