I Solved It
I had a similar problem with my PES2008, but what I couldn't hear were the effects (refferee, menu sounds, crowd, etc.). I just re-installed my old audio drivers, those they gave me when i bought my PC (tried to update but surprisingly it didn't work), and now everything is OK. Moreover, it fixed another problem I had: the game hung up when I used the "exit" option. So it's all in your sound configuration, try to change it or install another drivers.