Here´s my problem,

http://img391.imageshack.us/img391/2930/screenshot000hb7.jpg
http://img391.imageshack.us/img391/8937/screenshot004yt6.jpg

As you can see, all the planes an objects in the game looks dark.
And ideas how to fix it?
My PC is :
Amd x2 4000+
2Gb ram
Nvidia 9600GT (Forceware 177.79 beta)
Windows Vista