Windows Xp validation incorrect and i havent entered the key yet

[Guest]

i've built my new pc with new and old parts im using my old harddrive and a
new motherboard processor, hardrive was wiped reinstalled windows xp service
pack 2 im asked to validate i get my validation key ready i load up the
validation program and i click yes to validate no to register as the window
appears to enter the key it says at the top of the window INCORRECT
KEY......i havent entered it yet, but i enter my key anyway and click retry
and it just states incorrect key

any help appreciated

 

[RobinS]

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Robin S.