Chris,
I've been running in for 5 years on a dedicted laptop (which acts a printer server and nothing else), Win XP Home and never crashed once.
3 electricity supply cuts in that period and it recovers fine.
Had a couple of issues once when the laptop had to be re-started due to a VNC lock-up but then that had nothing to do with Cortex. I think there is a pretty good recovery mechanism in it and a little monitor called Defribrilator that keeps an eye on it.
Works for me.
N.