Just fill in "username" and "domainname" fields, then save as vbs and run.
Code Select
strComputer = "."
Set objWMIService = GetObject("winmgmts:\\" & strComputer & "\root\cimv2")
Set objAccount = objWMIService.Get _
("Win32_UserAccount.Name='username',Domain='domainname'")
Wscript.Echo objAccount.SID