Using other people's product keys is considered piracy. You will need to call Microsoft support and they will tell you why the key is not working. Sometimes it is because you have home edition and your putting a key in for professional. Either way they are the ones to help.
V2C47-MK7JD-3R89F-D2KXW-VPK3J this product key is valid for windows xp professional sp2 or sp3
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