$domain = "test.com"
$password = "Mypass" | ConvertTo-SecureString -asPlainText -Force
$username = "$domain\administrator"
$credential = New-Object System.Management.Automation.PSCredential($username,$password)
$ouPath="OU=workstations,DC=test,DC=com"
add-computer -Credential $credential -DomainName $domain -OUPath $ouPath -restart -force