From the original CD:
g:\SAV\setup.exe /a >> run in administrative mode
copy all files from unpack directory to your $OEM$\$1\install\SAV\
In your CMD file, put this :
ECHO.
ECHO Installation de Symantec Antivirus Corporate 9.1
ECHO Please wait...
start /wait %systemdrive%\install\NAV\Symantec_AntiVirus.msi /passive /norestart
start /wait %systemdrive%\install\NAV\SAVCE_9.0.0.1400_AllWin_FR.msp /passive /norestart
taskkill /IM LUCOMS~1.EXEe /F
taskkill /IM VPDN_LU.exe /F
taskkill /IM LUALL.EXE /F
ECHO.
ECHO Updating Virus Def ... Please wait ...
start /wait "%PROGRAMFILES\Symantec AntiVirus\VPDN_LU.exe" /s
Taskkill => kill LiveUpdate started from installer
VPDN_LU.EXE /s run liveupdate silently
This work fine from my french version XP SP2 / Corporate 9.1 FR