You can do this:
@echo off
>nul 2>&1 "%SYSTEMROOT%system32cacls.exe" "%SYSTEMROOT%system32configsystem"
if %errorlevel% NEQ 0 (GOTO askAdmin)
GOTO gotAdmin
:askAdmin
::batch is being ran as normal user
echo I'm not an admin yet
>nul 2>&1 "%SYSTEMROOT%system32cacls.exe" "%SYSTEMROOT%system32configsystem"
if '%errorlevel%' NEQ '0' (
echo Requesting administrative privileges...
goto UACPrompt
) else ( goto gotAdmin )
:UACPrompt
echo Set UAC = CreateObject^("Shell.Application"^) > "%temp%getadmin.vbs"
echo UAC.ShellExecute "%~s0", "", "", "runas", 1 >> "%temp%getadmin.vbs"
"%temp%getadmin.vbs"
exit /B
:gotAdmin
if exist "%temp%getadmin.vbs" ( del "%temp%getadmin.vbs" )
pushd "%CD%"
CD /D "%~dp0"
::batch is being ran as admin
echo Now I'm an admin!
pause
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