M4640g i7 How to use a different product key?

I have a Veriton M4640g i7 that I rebuilt. I put a new SSD hard drive in it. It came with Windows 7 so I tried loading Windows 10 on it from a USB drive. I have a Windows 10 home license, which I purchased. It is not the OS that came with the PC. When Windows 10 finished loading, the Activation area says it's Windows 10 Pro and already has a product key in it, which is NOT the one that came with my Windows 10 home disk. I tried to enter the product key from the link on that page but it will not let go of Windows 10 Pro or the License key that it says that I have installed. I haven't found that license key anywhere, nor do I want to use it. I want to use the OS that I purchased. Can someone tell me how to force it to let go of that product key? I read somewhere that a lot of PCs store that information in the BIOS, but I can't see any section in BIOS that would allow me to remove or change it.

(Thread was edited to add model name to the title)

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@will2power

If I were you, I'll be happy with a Win 10 Pro instead of Win 10 Home, as Win 10 Pro is more powerful and can enable virtual memory environment. Being an originally Win 7 PC, there maybe some old 32-bit programs that probably will be still useful, that can be used under virtual environment, and that is only available under Win 10 Pro.

I cannot remember how to force changing the product key off head, but will look it up and probably come up with it within a couple days, if you still insist on using the Win 10 Home.