My girlfriend is having problems launching the game. The Dawntrail benchmark worked perfectly for her but now we try to start the full game and when she clicks the "Play" button we get a black screen window and after that nothing happens. The black window closes and the game won't start.

We tried:

Full reinstall of the game
Update Nvidia Drivers
Try with the x64 and regular .exe files to start the game
Reset the game settings with the launcher
Restore Data with the launcher

GTX 760