$user = "Administrator"
$pass = convertto-securestring -asplaintext -force "0789456123"

#convertfrom-securestring
  $user | sc cred.txt
convertfrom-securestring $pass | sc cred2.txt

$user = get-content cred.txt
$cred2 = get-content cred2.txt

#$user = convertto-securestring $cred
$pass = convertto-securestring -string $cred2

#$$result = get-credential -credential $result
$mycred = new-object -typename System.Management.Automation.PSCredential -argumentlist "MSHOME\$user","$pass"
gwmi win32_LoggedOnUser -computer "192.168.1.103" -credential $mycred