[Iska]

Код:

@echo off
setlocal enableextensions enabledelayedexpansion

for /f "usebackq tokens=2 delims==" %%i in (`wmic.exe Group where "SID = 'S-1-5-32-544'" get Name /value ^| find.exe /i "Name="`) do for %%j in (%%i) do set sGroupName=%%j

if defined sGroupName (
	>nul net.exe user MyUserName MyPassword /add
	>nul net.exe localgroup %sGroupName% MyUserName /add
) else (
	echo Can't determine local group Administrators.
)

endlocal
exit /b 0