Did you try isibon's suggestion at the top of this page?
"I was able to resolve the fullscreen issue in the NVidia control panel.
Go to "Adjust Desktop size and position"
Select the following options:
Full screen
Perform scaling on GPU
Override Scaling mode set by games and programs
The game will still start up windowed (despite being set in game options to fullscreen), but simply alt-tabbing into it will make it properly full screen."
As made clear earlier in this thread, that option is not available to laptop users.
