Yeah, Windows is not included with this purchase. I'm not sure how difficult it will be to install Windows.
Stupid easy. You just have to get the USB loading tool from microsoft and download the proper version of Windows on it
Then run the install from the front USB port
Also there's barely any difference between a 860m and a 960m performance wise, the R2 version isn't really worth it when it's 500$ more than the i7 one... so go for it