For Each objOS in GetObject("winmgmts:").InstancesOf("Win32_OperatingSystem")
If InStr(objOS.Caption,"XP") = 0 Then
If WScript.Arguments.length = 0 Then
Dim objShell
Set objShell = CreateObject("Shell.Application")
objShell.ShellExecute "wscript.exe", Chr(34) & _
WScript.ScriptFullName & Chr(34) & " uac", "", "runas", 1
Else
Call Main()
End If
Else
Call Main()
End If
Next

Sub Main()
MsgBox "UAC demon"
End Sub