Go to your main screen then just right click, select properties, then go into settings and drag the screen resolution bar to the more side and select ok and hit yes when the little box comes up.
i have the same problem, but when I tryed your solution, I found that it was already at the highest grafics thing, but its still to magnified, please give me an answer :S
some laptops like Sony have a magnification hot key (one of the function keys) normally pressing that key for a second time will cancel the magnification.