Xp activation problem

elniro

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I installed XP home SP2 from disc i had at home but obviously i couldnt register the cd-key cos its already being used by diff computer so i got a legit key and a key-changer which changes the key in the register. I then tried to activate the key but it says unvalid key or something along those lines.

The legit key is from XP Pro SP2, does this matter that i installed a home edition and im trying to register with a pro cd key?
 
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