Questions About Audio & Sound Track.

[FEAR]

Hello all,

I just bought the game, I installed, activated the code, launched the game.
Until here everything works fine, but ... From the first mission, there is no sound, nor in the cinematics nor in the game, only in the menus and radio.
Yet I have changed the Audio options in the configuration of the game, but ... It gets worse!

Help me as soon as possible, because this game is awesome, I do not want to lose a quality game as perfect, but I also do not want to lose my money for nothing ...

Thank you.