Amnesia won't start new game and full screen doesn't work at all

[Guest]

Okay so I bought the game and installed it. When I try to open it with full screen the screen get dark and nothing happens. When I start it in windowed mode the game starts and I can create a profile but when I press "start new game" the loading screen won't disappear and the game freezes. I've tried starting it as admin, I've installed 2 different drives and re-installed it twice but nothing works.
My computer specs are:
Intel® Core™ i7-4700HQ CPU @ 2.40GHz
RAM: 12GB
Graficard: NVIDIA Geforce GTX 765M
Windows 8 64-bit

It worked on my other computer but only in windowed mode. I want to play it on this one with full screen! (kind of a newbie with advanced stuff and English isn't my first language so be patient with me)