Neveser..sorry to hear you arent having much luck.
Ive never really had any issues wi nvidia drivers except some Beta drivers I installed didnt work
I did have a radeon at one time and I had more problems wi that card than any of my nvdia's.
EVGA WEBSITE has almost the same list of drivers as the nvdia geforce site..I wouldnt advise trying any Beta drivers.. but then again maybe
youd have better luck wi those.
I set up my monitor first of all.. play a dvd in widescreen mode to get the black borders top and bottom.. adjust brightness/contrast controls to get movie-black almost similar to the border-black..that way I have a black-on-screen-base-line so to speak.
then I can adjust ingame brightness/contrast to suit.
In E

I dont use any of the colour enhancement tools Ive seen being talked about.. EDFX??..
I tried it once but felt it was washing out the colours
Hope you solve it soon