Go here
C:\Program Files\Stardock\TotalGaming\GalCiv2
And open the Debug.err
Then look for the 3(third) Paragrapgh, it has the primary soundcard used in your computer, on the top is your Sound Card Model, then on the bottom of the paragrapgh is the date of your sound card's drivers.
If you dont know the site for the drivers, but you do know the correct model being used, go to this site and register for free drivers of ALL hardwares.
HARDWARE DRIVERS SITE"You have problems using that site post here, and Ill try to guide you through it.
Good Luck
Monc34