Can't complete Win 10 install

[Windows 10]

I have a Dell Inspiron 3668 desktop. It originally came with Win 10 but I installed Ubuntu. I want to go back to Win 10 but still keep Ubuntu and so I bought another hard drive. A Youtube tutorial showed a choice to create an account to log in, or to create one's own personal login. My Win 10 pro does not give this option. I have to create an account. When I try to do it, it then forces me to create a Child account. I have not children, never had, there are none in the house, never were and never will be, but it still is forcing me to create a child account. I can't get past this. How do I get

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