just go install windows 2000, most keys work for it, and windows update doesnt genuine advantage 2000..
when i 1st got 2003..
i downloaded it from microsoft, they gave me a serial
then i cracked it, and killed the time bomb, so i had a legal copy of it, forever, now you could say i have a "legit" copy.
XP is nice, its all eye candy, if you just want a good O/S , id choose 2003 and XP, and 2000 if you just want to be able to play some darn games!