Abit website is still runied and i just noticed that: In audio configuration it says: Green - Front Speaker Out, Orange - Rear Speaker Out, Black - Center/Subwoofer Speaker Out. However on my sound system it is:
Green - Front Speaker, Orange - Center/Subwoofer Speaker Out, Black - Center/Subwoofer Speaker Out.
By connecting Green to Green, Orange to black and Black to orange, my speakers works normally on 5.1, however Subwoofer is still muted... And by the way if i uninstall the drivers and reinstall them using windows update i still got same problems. Well i havent touched my cables and my sound system, so its must be drivers problem.