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

    echo exist & pause

) else (

    echo not exist & pause

)

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

if not exist "C:\Program Files (x86)\" echo WIN_x64 & pause

echo WIN_x32 & pause

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

REG QUERY HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\

IF %errorlevel%==0 GOTO SKIP

echo ERROR & exit /b

:SKIP

echo Skip em (Already Installed)

pause

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