Например, так (Windows XP SP3):
Код:

@echo off
setlocal enableextensions enabledelayedexpansion
for /f "usebackq tokens=1,3" %%i in (
`2^>nul reg.exe query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion" /v "SoftwareType" ^| find.exe /i "SoftwareType"`
) do set s%%i=%%j
if defined sSoftwareType (
if /i "%sSoftwareType%" equ "System" (
echo [SoftwareType] value is [System].
) else (
echo [SoftwareType] value is not [System].
)
) else (
echo Not found [SoftwareType] parameter in [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion] subkey.
)
endlocal
exit /b 0