@ECHO OFF
SETLOCAL
SET RegKey=HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion
SET RegKey=%RegKey%\WindowsUpdate\Auto Update\Results\Install
FOR /F "skip=1 tokens=2*" %%A IN ('REG Query "%RegKey%" /v "LastSuccessTime"') DO SET LastWUpd=%%B
IF "%~1"=="" ECHO Last successful Windows Update: %LastWUpd%
ENDLOCAL & SET LastWUpd=%LastWUpd%
IF "%~1"=="" GOTO:EOF


:Syntax
ECHO.
ECHO LastWUpd.bat,  Version 1.00 for Windows XP
ECHO Returns the date and time of the last successful Windows Update
ECHO.
ECHO Usage:   LASTWUPD
ECHO.
ECHO Return:  Displays a message with the date and time of the last
ECHO          successful Windows Update, and saves this date and time
ECHO          in an environment variable: LastWUpd=%LastWUpd%
ECHO.
ECHO Note:    Tested only in Windows XP SP3 and Windows 7 RC
ECHO.
ECHO Written by Rob van der Woude
ECHO http://www.robvanderwoude.com