Call your son and make sure that you have the correct username and password.
If that doesn't work, sign up for a new Microsoft account.
Also, there is a difference between a 'pin' and a 'password' - make sure that you are entering the one it wants
I have been playing old games on my desktop PC running windows 7 for years and when I play the games they have always played in the correct aspect ratio - with the black bars on the side to make the screen more like a square. When I first tried to play them on my Surface pro 2, they ran in the...