u shouldnt get no worries, if you didnt get the devils0wn winxppro serial number.
check the for the system properties > product id -- to be sure that u r eligible to install sp1. check for those blacklisted product id combos.
once again, if u used a bluelisted 'legit' key u shouldnt get no worries.
go to start > programs > windows update. it will ask you to install something about twice. do it until u get the windows update page
