DirectX games don't work in fullscreen mode anymore

I have had a problem with my laptop for quite a while now, it does not seem to be able to play directX games in fullscreen mode. It is an Asus N55SL i7 1600x900 version. The strange thing is that i used to be able to play all my games in fullscreen, and then slowly one by one they stopped working, and now i have to play them in either windowed or fullscreen windowed. My pc works fine for OpenGL games and some DirectX games. for example, assassins's creed 3 works in fullscreen and war of the roses.
None of the versions of directX work, I have tried on mount and blade from directX7. I suspect it to be something wrong with the graphics card, my friend has the same problem with a Dell XPS with a Nvidia GT 525.

Games that don't work are: Borderlands 2, Dark Sols, Dishonored, L.A. Noire, Left 4 Dead 2, all Mount and Blades, assassin's creed 2, Planetside 2 and all the total war series. Most of these games did work on fullscreen at one point, now i am forced to type in the -windowed command before starting them.

I have upgraded to the highest drivers on nvidia's website, I have re installed paint.net, c++, directx and i have installed directx sdk.

My Specs are
CPU: Intel i7 2670QM
GPU: Nvidia Geforce GT 635M
Screen: 15.6", 1600x900