[Whos_Ur_Paddy?]

have been playing san andreas and its been fine up till now. I am half way through and now all of a sudden all sfx is gone i have the radio stations still and they work but gun fire opening of car doors video sequences etc are no sound w.t.f. is going on does anyone know what could be doing this ,i have a audigy 2 zs sound card ps. i also did a format and reinstall to see if this could fix it but no same problem even if i start a new game