My PC goes above all the reccomended requirements, and i can play it on extreme graphics without any lag, but no matter what qualtiy i run it on the Units (when i zoom out a bit) turn into brown green and purple squares, aswell as the sky turns murky brown color and it look really awful and pixelated. I bought a graphics card Geforce 9500 GT. i guess its a incompatability problem so do i need to downgrade my drivers or something?