XP has a lot more technological things; but 2000 is cheaper and does the job fine. Only a few programs that can go on XP can't go on 2000 and that's mainly because of the tech stuff and there're generally Office or Windows Media Player... that sort of thing.
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.