Re: Seriously WTF?!
Well considering that it still makes sound in other programs, it might be a driver issue. Is there any other drivers you can find for the card (newer/older) that you can try out? Also try going into your bios and checking if the on board audio is disable/enabled. If its disabled, that's why it wasn't working, but if its enabled, try disabling it, and you might get sound from the other applications. I think it would be worth a shot.
Go to Start/Control Panel/Sounds and Audio Devices
Go to the Audio tab and see what is in the Sound Playback section. Tell us whats in those sections.