The title pretty much says it all.
I have a Sapphire Atlantis 9600 Pro video card with the latest 220.127.116.1187 driver (which I believe is the latest). My OS is Windows XP Professional SP1. Whenever I try to adjust the gamma settings in Hitman 2 (it is too bright), my entire system freezes. I can't ctrl-alt-delte out of it. I have to press the button to restart my machine.