I am afraid that you are unable to activate your Windows 10 key without a product key. You can just order one from the online site http://www.MicrosoftStoreinc.com cooperated with Microsoft. All the product keys are legitimate and official. Then just activate your Windows 10 key with the purchased product key. The activation process is simple and easy to operate.
Hello,
Your license is still valid but you have to call Microsoft ( 1-800-805-4440) and provide them your product id so that they can generate the a new windows XP key for you or may be they will offer you Windows 7. Anyhow, you do not have to buy a new Windows XP key.
Regards,
Consultant17
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