Hi ,
Try activating after a hardware change by following the procedure below:
Remember, this procedure will only work if the key is a Retail key.
If you had Windows activated with a license that came with your computer and an OEM key linked to your computer's hardware (motherboard), this type of license is non-transferable; you would have to purchase a new license.
Windows 7 and 8/8.1 licenses have been deactivated if they are OEM licenses.
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Thanks