Need Help for Co Partner

ok i used to use the win2k CO partner but now coz of the newest patch it dont work no more. i was wondering if someone could tell me how to update to win XP SP2. coz i have a illeagal version and i cant update of microsft web site.
i have XP pro SP1 atm.

u cant update with a bootleg version, sorry

it will always say "Error: Cannot determine Version number" or something like that