[H] To Protect and Defend

[Winterlight]

I just did a Kill Disk wipe followed by a  clean DELL XP PRO  install 
on a Dell Inspirion 700m laptop, which belongs to a 18 year old girl 
who is headed off to college. I am keeping this setup as clean, and 
quick as I can. I am going to install Word, and a couple of MS and 
Goggle apps, some maintenance, and diagnostic freeware, and leave it 
at that which is all she wants, and probably needs.

 Of course, being a teenage college student I am sure it will be 
use  all sorts of peer to peer stuff like limeware, facebook, and who 
knows what the next thing is. Security in mind, I do not want to load 
it up with a lot of intrusive draconian AV firewall stuff that blocks 
everything, pops up all the time, and sucks up all the performance of 
a older single core processor = 1.7M. At least with her games are not 
going to be an issue although wireless hot spots are.

So what do you guys think is the best FREE approach, for  a firewall, 
anti malware, antivirus solution.