:! I'm sorry, I fear one of the more Windows-savvy folks here will have to help. I'm on a Mac and I'm running Windows in a virtual machine.
Anyway, in my Vista Colo(u)r Management preference panel there are three tabs at the top (Devices, All Profiles, Advanced (my Translation from a German Vista)), and in the All Profiles and Advanced tab you should be able to change sth. Just it doesn't change anything on my virtual machine, these prefs are probably overriden by Parallels Desktop, the virtualization software I use to get Windows on my Mac.
Perhaps you could just fumble a bit w/ the Contrast and Brightness buttons, given that your laptop has such?