Hi @SuttonWillow , welcome to the FORUM!
Indeed, you will need to reinstall Windows.
Please find instructions on how to do so on this link here
You will be able to select which version to install, so please make sure you choose W10 Home.
Your activation key should be enough to activate W10 later.
Don't forget that you can always contact Microsoft support if you need it.
Regards,
Gehringer
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