@ECHO OFF
:: Quick and dirty test for Windows Update.
:: No guarantee, as I couldn't test failed Windows Updates.
:: Checks if the last WU install was later than the last WU download, if not it will report a failure.
:: Written by Rob van der Woude
: http://www.robvanderwoude.com

SETLOCAL
SET RegKey=HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\Auto Update\Results
FOR /F "skip=4 tokens=2*" %%A IN ('REG Query "%RegKey%\Download" /V "LastSuccessTime"') DO SET LastDownload=%%B
FOR /F "skip=4 tokens=2*" %%A IN ('REG Query "%RegKey%\Install"  /V "LastSuccessTime"') DO SET LastInstall=%%B
IF "%LastInstall%" LSS "%LastDownload%" (
	ECHO Last Windows Update failed ^(%LastDownload%^)
) ELSE (
	ECHO Last Windows Update succeeded ^(%LastInstall%^)
)
ENDLOCAL