@CaKiYT
Welcome to HP Support Forum. The best option now is to reinstall Windows 10 using media (USB, DVD) from the following information
https://www.microsoft.com/en-au/software-download/windows10
During the installation process, select SKIP when it asking for a product key and continue. Windows 10 will activate when you come online because the key is in the BIOS of your machine.
Regards.
BH***
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