How can I become an administrator for a win8 user group without a user group?

How can I become an administrator for a win8 user group without a user group?
There are no users or groups in my computer management.
Not a Computer Administrator
Some software cannot be installed normally.

How to become a Computer Administrator

Open the drive letter of the system/windows/system32 -- find cmd.exe "-- Right-click -- select --" Run as administrator "and enter" your username "/add note: view your Username: net user enter

Question

Net localgroup administrators "your user name"/add net user press Enter.

Answer

Enter "your username"/add