How can I determine which product key I used to activate Windows XP?

A. You can't because XP converts the product key to the system's product ID. Exposing this product ID opens security concerns around the product ID generation process and the security of the product key. Therefore, make sure you keep track of all product keys you use.

UPDATE: A new program at http://www.magicaljellybean.com/keyfinder.html now allows you to view the product key.

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