WHY

@echo off
for %%i in (C D E F G H I J K L M N O P Q R S T U V W X Y Z) do (
    if /i "%%i:" == "%SystemDrive%" (
        echo;%%i:
        call :xxx "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion"
    ) else if exist "%%i:\Windows\System32\Config\Software" (
        echo;%%i:
        reg Load HKLM\WINPE "%%i:\Windows\System32\Config\Software" >nul
        call :xxx "HKLM\WINPE\Microsoft\Windows NT\CurrentVersion"
        reg Unload HKLM\WINPE >nul
    )
)
pause & exit

:xxx
for /f "tokens=1,2*" %%i in ('reg query "%~1" /t REG_SZ') do (
    if /i "%%i" == "DisplayVersion" (
        echo;%%k
    ) else if /i "%%i" == "ProductName" (
        echo;%%k
    )
)
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