in xp you could change it by going to
-start menu
-programs
-accessories
-system tools
-activate windows
then you can change it when you click that you want to register over the phone and should be a change product key button
in xp you could change it by going to
-start menu
-programs
-accessories
-system tools
-activate windows
then you can change it when you click that you want to register over the phone and should be a change product key button