no sound !!gm fix problem pleaseeee ! ty

its 28-09-09 when i stared to play crossfire i joined a ghost mode game and when i shoot i cant hear my gun shots i can only he people say " fire in the whole " and" bomb spotted " nothing else i checked my sound settings and all sound settings where on i dont know whats wrong with it now i had to re-install crossfire and that takes so long due to its 13 updates can you please fix this problem its happend 2 times in the past a.s.a.p thats it and keep posting to my thread and can you tell me whens the next update after the previous one ok ty for your time