Fix for dim screen when using ATI drivers on Vista
I was disappointed when the display on my new computer with a fresh copy of Vista (not 64bit) looked like a light bulb burned out. A quick google revealed the fix:
Under the Catalyst Control Center, under Colors, if you scroll down there is an option for Black and White Levels. On Vista64, this option is most likely set to PC Standard. Setting it to Microsoft MCE standard will restore the brightness of colors.
Credit goes to this guy: http://www.vistareadygames.com/showthread.php?t=42530