Contrast/brightness/gamma Adjustment

I have an ATI graphics card which I had problems with after my son tried to install a copied game on my PC. Basically it altered all of the settings so I had to re-adjust my windows settings and also the in-game settings on some of my installed games.
It's all sorted now, but the only game that I cannot re-adjust the colour/gamma or brightness settings on is GW. It's very dark, particularly in the hubs and I cannot find any in-game way of adjusting them. Can anyone help please?

Adjust the brightness and gamma controls on your monitor or goto control panel/display/settings/advanced and adjust the controls there and save as a profile.