Quote Originally Posted by SKYMTL View Post
There is a 50 / 50 chance of it happening with the ATI drivers. I have no idea why but one way or another, you should reboot in order to ensure everything is working properly.
reboot is only required when you manually uninstall the driver first or on a fresh windows installation; running the new driver setup without removing the old drivers first (as recommended by AMD) is much more trouble free, creates less errors and requires no reboot