I downloaded my copy of Advent Rising from Steam a couple weeks ago. It plays fine with no errors except there is no sound every time a cut scene plays. I am using WinXP SP3 with a Pentium D 3GHz and an 8600GT 256. I also have updated DirectX drivers and it's just this one game that something like this happens.

The game runs absolutely fine except I can never tell what the poeple are saying when a video plays. What can I do?