How to Change the Windows Product Activation Key
When Service Pack 1 was released for Windows XP, Microsoft realized a large number of versions were pirated, so they altered future operating systems and upgrades so they would not work without a valid product activation key. This caused some who had been using pirated keys to purchase legitimate products so they needed to change the key.
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Instructions
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Open the Control Panel by clicking the "Start" button and then selecting "Control Panel."
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Open "Systems and Maintenance" by double-clicking the icon.
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Open "Systems" by double-clicking the icon.
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Scroll to the bottom of the folder and click "Change Product Key." When prompted, enter the new product key. Assuming you have entered a valid product activation key, the product key is now changed.
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