Hello and welcome to the forum.
Yesterday I was create a built-in administrator
You don't "create" the "built-in" administrator account. It already exists and is normally hidden. You can enable it.....
net user administrator /active:yes
OR
disable it
net user administrator /active:no
AND
That account is not typically used for day to day computer uses, there are a few Apps that do not function well or at all, when using that account.
I want a user account. What to do??
IF you want a new local user account that is also a member of the local administrators group, try this
Go to
C:\Windows\System32
Find
Cmd.exe (if you are hiding extensions of known types it might simply say Cmd)
Right click it and choose run as administrator
At the admin command prompt type
net user JohnSmith /add
hit enter
then type
net localgroup administrators JohnSmith /add
hit enter
type
exit
hit enter
Restart and log in as JohnSmith
NOTE: Obviously it doesn't have to be "JohnSmith". Any Tom, Dick or Sally should work fine (dealers choice).