@echo off

if exist "C:\Program Files (x86)\" (

    goto E

) else (

    goto N

)

:N

echo no exist

pause

:E

echo exist

pause

======================================================

REG QUERY HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\

IF %errorlevel%==0 GOTO SKIP

start /wait em.exe /q

goto DONE

:SKIP

echo Skip em (Already Installed)

:DONE

pause

======================================================

@echo off

:LOOP

echo example

SET Choice=

SET /P Choice= ~ASK~ =

ECHO.

IF /I '%Choice%'=='yes' GOTO Y

IF /I '%Choice%'=='no' GOTO X

IF NOT '%Choice%'=='' SET Choice=%Choice:~0,1%

echo a. yes

echo b. no

:yes

echo ok

goto exit

pause >nul

:no

echo no

pause >nul

:exit