How do I fix some sound issues, such as hearing static during NPC dialogue?

1. Go to Start -> Control Panel -> Sound
2. In the Playback tab, right click on Speakers (or whatever has a green tick next to it), then click Properties
3. In the advanced tab on this new window, select 24 bit, 44100Hz (Studio Quality) in the drop down menu

sourse: http://www.sevenforums.com/gaming/19...et-game-2.html

Give it a try. Hope it helps.