>>1
I'm in fact using a personal computer with xp service pack 2, unpatched(since sp2 release) and without any firewall/antiviruses.I have Common Sense 2013 Paranoia Edition though.
It run like a charm for all those years, but my PC started to overheat(i suspect its summer temps) or something and now restarts randomly each few hours(only if there is some load. Idle it can stand for months). When i get a new PC in a few years(or later) i'll think about switching to some user-friendly lunix distro if XP doesn't have drivers for it.