My Game Is Too Dark !!

all my monitor settings are up all the way.. When I go into a cave or anything like that in Guild Wars the surroundings are way too dark it's just unjoyable !

I used to have a program when I played other MMO's a while ago where I can just overbright my screen and it worked well on all my games.. I formatted since then I can't remember the name !! can anyone help me or have a program to recommend !! thanks a bunch ! --Jmac

My guess is that caves are supposed to be dark. Have a screenshot for us to see?