Thanks for the suggestion. I did mess around with the speaker settings to no avail.
I basically hear everything in the game, except for GLaDOS. Then their is the also the problem with the portal which sometimes stays blue and I cannot walk through it.
I downloaded the demo version of Portal the other day and really enjoyed the game. Had no problems with the game.
So I decided to buy the game and downloaded it from Steam this morning.
Now I have a problem. I cannot hear GLaDOS's voice. I don't hear any music either. I hear the portal...