The commands below are to be entered into command prompt as an Administrator. They’re mainly just for quickness since some of us prefer to use commands instead of clicking around a control panel.

Add user account (change password to your own):
net user john password /add

Delete user account:
net user john /delete

Add user to a group:
net localgroup administrators john /add

Delete user from a group:
net localgroup administrators john /delete

Disable user account:
net user john /active:no

Enable user account:
net user john /active:yes