I inherited a pc running Windows10 22H2, how do I do a reset without losing data?

[Windows 10]

I inherited a pc and want to reset the OS. With windows 10, same as current. I used cmd prompt to takeown of the D drive as new admin, and it did grant me access as the owner of that drive, but after a restart, it reverted back to Access Denied. how can I gain full rights as Admininstrator so I can perform a fresh installation? Also. will I need a product key? If so, how can i attain one if I lost the old one at no cost?

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