Why should or is the account for one computer called "Admin", but on another computer the account name is a name which the user who set it up chose?
Both of these computers have only ONE single local user account; NO other local user accounts.
Further, one the one machine there is found C:\Users\Admin
and on the other machine is found C:\Users\NameChosenUponSetup, where NameChosenUponSetup would be something like joe123, or michaelJ, or something resembling a normal-like name.
Either computer will let a user run programs and install and uninstall programs.
That in first sentence is the question and desire for understanding the what and the why.