Re-entering product key

Microsoft tells me the product key I entered on installing XP belongs to a blocked volume license, and claims I have an illegal copy, but it turns out the key I used belonged to my old machine, and so I want to enter the key I got with my present machine instead. Do I have to reinstall everything from scratch, or is there some way to enter the new key, after XP and a ton of software has been installed?
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More about entering product
  1. Do you have a COA sticker with the Product Key on it?
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Microsoft Windows XP