windows xp home edition product key/xp proffesional installed on my pc

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  Hello:

  My dell desktop has different product key compared to  the product key outside on the box. The product key on the box is valid. The installed product key is invalid. I want to update the installed xp with product key on the desktop. I don't have the original cd. Any comments on how to resolve this issue would be helpful.

  thank you. 

  Saturday, January 11, 2014 11:38 PM