Add this to the beginning of your file:
Set WshShell = WScript.CreateObject("WScript.Shell")
If WScript.Arguments.Length = 0 Then
Set ObjShell = CreateObject("Shell.Application")
ObjShell.ShellExecute "wscript.exe" _
, """" & WScript.ScriptFullName & """ RunAsAdministrator", , "runas", 1
WScript.Quit
End if