Your drivers for you audio card may not be up to date. Please go here to go to the website for your audio cards. The screen is too dark The game has dark places in it and that is normal. However, if it is too dark so you cannot see most of the time, then you need to adjust your monitor. You need to adjust the brightness and contrast levels of your monitor.
Most monitors have controls on the front, sometimes behind a panel.
While you are playing the game and in a dark area, turn up the brightness control your monitor some. Then, turn the contrast control down some so the screen is not bright. Additionally, you may need to make sure that no light from an outside source is causing glare problems on your monitor. Close the shades or curtains if possible. Finally, in the game, you can find a Brightness setting within the Options menu.