Oh yeah.
There is some great advice on this thread!
In defense of the stray, he is a really smart kid and he really is good with computers. After getting the system back up it appears that the old router might have just crapped out after he downloaded a few gigs of crap.
There will be no p2p as his rights have been reset to user.
I was that way, too. Now I'm majoring in Computer Science at the University of Virginia.
That said, it might be a good idea to teach him the distinction between computers that just have to work and computers that he can experiment on and learn from. And, when I grew up, the RIAA wasn't running amok, suing people left and right.