They are not different pieces; if you update your Intel® HD Graphics, you are updating the audio driver as well.
In this hyperlink you can find Intel® HD Graphics 4000 for 3rd Generation, for your controller.
Nice to come back :-)
In fact, I did'nt have to reinstal, I solved my problem otherwise (... Which was : no sound at all ! But my helmet was plugged to my receiver, which cut loadspeakers, that was why... The silly me :-))
The drivers work fine, so far.