It is probably related to your video driver settings. My settings are in such a fashion that when I'm in my normal activities it is darker, but when I run a game, the brightness goes up. If you're running an Ati card, use CCC to check/change your settings, if nVidia, the equivalent program. If you aren't running one of these brand cards, I'm not sure what else to offer, maybe some form of 3rd party program?
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CPU- Pentium EE 840 @ 3.2Ghz (Intel mobo, no OC)
RAM- 2Gb Dell brand, 533Mhz
GPU- HIS 4850 Ice Q4
PSU- 460w Dell XPS
Case- Tacky Dell XPS gen 5
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