Audio/Video not in synch during in-game cutscenes.

Hello everyone. I'm at my wits end here, so I'm hoping someone here cna help me solve my problem.

In just about every single game I play, the audio in my game cutscenes is out of sync. The sound lags behind the video. After the cutscene is over, and as I'm playing in-game, everything is fine. But it's almost every game I have is like this. I have updated video card drivers.

Here is what I'm running:

Intel i7 950 quad core
P6TD Deluxe MB
6GB DDR3 RAM
2x HD 5770's in Crossfire Mode



Thank you for any help in advance

Bob