well, its not having having the game installed, its the licence agreement that goes with it, thus shareware is only active for say 30 days, or is only a snipit of the game/program. freeware on the otherhand (like what you are using right now) has a free licence agreement, but you can't say winamp is yours and make money out of it.
so if you asked to nice game devolpers if your friend could buy another copy of the licence agreement, then, it would be legal to do so.
btw, i may no all this, doesn't mean i follow it. My multimedia teacher hates me because i own pirated version of every program that we use.
btww, if there are any cops/sniches/people who report these things to people to come and hurt me, you didn't read that.