Win10 - Come attivare nuovo account locale con diritti di amministratore
To add a user account to the local system:
net user /add <username> *
To give a local system user local administrative privileges:
net localgroup administrators <username> /add
To delete a local system user account:
net user username /delete
IMPORTANT:
Deleting a local user DO NOT REMOVE its home folder (C:\Users\<username>)
You need to remove it manually