Star Wars Knights of the Old Republic II: The Sith Lords

Why do I keep hearing static in Star Wars Knights of the Old Republic II: The Sith Lords?

• Your sound card may not be fully DirectX compatible.
  
  

• You may need to update the drivers for your sound card.
  
  

• Your volume may be turned up too loud in Windows.
  
  

• Your amplified speakers may be plugged into speaker-out on your sound card.