Windows 7 allows you to change the product key (or sometimes called serial number) of the product, even once you have already fully installed Windows. This can be useful if you buy a new license and need to swap keys.

To begin, right click Computer on the start menu and select Properties:

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Now, scroll to the bottom of this window and click Change Product Key:

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You can then enter the new key in the box provided and then click Next:

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Windows will then spend a few moments checking that this key is valid:

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Once complete, you a confirmation is displayed to let you know that the new key has successfully been updated:

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Ian, Jul 20, 2009
#1