$serviceName = "SamsService"
$exePath = "c:servicesservice.exe"
$userName = "mydomainserviceuser"
$securePassword = convertto-securestring -String "1a_really_$trong_password1" -AsPlainText -Force
$credentialsObject = new-object -typename System.Management.Automation.PSCredential -argumentlist $userName, $securePassword

New-Service -BinaryPathName $exePath -Name $serviceName -Credential $credentialsObject -DisplayName $serviceName -StartupType Manual