Age of mythology

Hi fellas, I have a game here belongs to a flatmate, age of mythology gold edition, question is how do I set it up on my computer so he can use it? obviously I am the administrater of the machine so I have simply called him guest.
I loaded the game on the machine setting the game to all users. I can play it on my side no problems but when I run it through his side it will not play properly, just stopping and starting all the time.