Windows 10 fails to install

[rocklodger84]

Hello - i need some help as I am struggling to install Windows 10 on a HP355 laptop which I was given by work when I left. It currently has Windows 7 and I was given a license by the office. I am using the media creation tool, but it gets to the end of the process and fails to install saying it failed to validate the product key....but i haven't even input this yet! Any help would be great as I'm struggling here!

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