Some help with STEAM please
I'm kind of new to steam (have been using it for a week now) so I'm not sure how it works properly yet. If I get a retail DVD of a steam game from a friend, can I buy a code or whatever from steam and then install the game from the DVD? I got Metro 2033 from someone but he has already used to activation code so I can't install it. I want to know if I buy the game from steam will I be able to install it from his disk instead of downloading the whole thing from steam (which I really, really can't do)?