User blog:JordanaBrewsterFAN/Mass Effect internet

Hi. I'm new here. I would like to buy the Mass Effect games starting with the first one for a personal computer. But I was wondering cause I would like to buy it and play it in the summer where I won't have any internet. Do I like need internet to play the game or simply to instal it? I mean. The first time that I play it when I need to make an account and put the password given inside by DVD. Is that the only time I will need internet and every following time I won't need the internet? Also. How many gigabytes do I need in my laptop for the game to play. Also does it play on Windows 7? Sorry for asking so may questions but I just want to be sure.