Add a new admin user to Windows via Powershell
This script will prompt for a new password, store it as a secure string, then provision a new user with that password. It will also add the new user to the Administrators group.
Command
$NewUser = Read-Host $Password = Read-Host -AsSecureString New-LocalUser $NewUser -Password $Password Add-LocalGroupMember -Group "Administrators" -Member $NewUser