Windows 7 Invalid Product Key activation error occurs while activating the product key of Windows 7. So, if you're undergoing such issues then you may be able to communicate Windows support freely to urge cooperation. An accredited technician can assist you out. I'm sharing a link to at least one of these blogs, simply browse the online log and learn the procedure to work out this issue.

Blog: https://www.microsoftwindowssupportn...ivation-error/