Do you see the microphone volume bar move in the "Recording" tab of the "Sound" control panel applet? Even when you have the Realtek speaker output as default?
Yes I can see the bar move in "Recording" tab of the "Sound" control panel applet, but not in voice attack option
I'll assume you have dual monitors connected via HDMI or DisplayPort, thus the NVIDIA devices. It's odd that those would interact with the Realtek driver at all.
yet it is correct, I use 3 monitors connected via HDMI and DisplayPort
On Windows 7, uninstalling the "NVIDIA HD Audio Driver" would get rid of those devices(which means you wouldn't be able to hear sound through the TV/monitor, if it has that capability) not sure if that works in Windows 10 as well. I wouldn't bet on that solving the problem, but it's something you could try.
what I did I disable the NVIDIA HD Audio driver even uninstalling it, but it is still the same result, I will try to connect only one monitor will let you know how it goes.