HELP with Hitachi CML174SXW B

[Volkswagen]

Well I got the LCD yesterday and it came with 0 dead pixels and it looks great...It is very bright compared to my old CRT....But in games such as UT2k4 and CS it sucks...Like everything is black and dark I cant stand it...I use a R9800Pro AIW via DVI connection along with the newst ATI Drivers....I tried to play arround with the settings but no luck

Can anyone help me out ?