If this is an OEM version of Windows then it has no activation key as OEM versions are "Pre-Activated" via the BIOS when booting to the OEM media to install the operating system.
If you installed the OS without booting to the OEM media (Or installed OEM media on a system from a different manufacturer), it will prompt for activation and there is no OEM key to activate it (Catch 22)
If this is an OEM system (HP, Acer, Dell etc) and you have the OEM media, boot to the media and run a clean installation of Windows (Delete the existing NTFS partition then create a new NTFS partition) to resolve
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