I finally managed to find a solution to the flickering. It is weird, but hey... it works.

I have downgraded my driver to 285.79 - it's faster in Metro! and it resolves the horizontal lines issue.

Open Nvidia Control Panel ->Adjust desktop size and position and select full screen.

Next, go to change resolution -> Customize -> Create Custom resolution -> Type 66 in refresh rate. Make sure Scan type is set to Progressive and hit test. If all works well, select yes.

* * * After this, there should be a Custom with you creation, above PC list. Select it, press the drop-down list and select 66 Hz with 32-bit Colour depth and hit apply.

If it doesn't work and it tells you it is not supported, type 132, select Interlace and hit test. Whatever happens (mine did some weird display glitches and I unplugged the laptop scared like s**t) just hit Esc.

If nothing works, just type 33 Hz, Select Progressive and hit test, it should wotk. If it does, select no and then type again 66 (probably some driver bugs).

Whatever way you manage to create that 66Hz, allways do the "* * *" part

Here is a site to test it, because of the background (It's the one that made me do all these tests): http://www.3dtotal.com/index_gallery_detailed2.php?id=4944&cat=scenes#.T7z1_EUnxkw

Now... Some people here say it's a hardware-created problem. Well, this shows it is. Here is the explanation. The Brightness LED's work in a frequency multiple of somewhere around 33Hz. As the display has a 60 Hz refresh rate, that makes a 6 Hz offset, which creates the flickering. It's like in sound - the resonance effect.

A non software way (and permanent as well) is to open the display cover and search for a special diode on that circuit board you guys were talking about. That has a screw-like cap and by doing some tests, you could calibrate it.