it was win7 x86 ultimate eddition(TR), now it is win7 x86 professional(EN). I just could download all (more than 130) windows updates with my last registered windows installation. Funnily, these updates also helped my mic issue with realtek alc 892 chip.
with previous win7 install, I could hardly hear the mic signal even shouting from 1 cm. now, installed on the car, 40-50cm away from me, driving on a bad surface(too much noise from winter tires) and Im not shouting, other side can clearly hear me. thanks to AEC and NS from ALC892.