First, you need to find your product key as a backup. It will usually be on the back of a laptop, or on the back of a desktop computer, or on a card.
You need to find this page to change the product key.
Click the Start button, find the control panel to enter, click the button system, you can find this page.
Enter your product ready to update the key is completed.
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How to activate with windows 7 with kms Pico ?
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