If you have ZoneAlarm Pro already installed on a PC, you can export from the registry the registration info, and then run the reg file after the silent install. that would give something like this in your unattended.bat (that's how I named it) file: ECHO. ECHO Installation de ZoneAlarm Pro with Webfiltering V 4.5.530 (Anglais) ECHO Numero de serie: xxxxx-xxxxx-xxxxx-xxxxxx-xxxxxx ECHO Please wait... start /wait %systemdrive%\install\Apps\ZoneAlarm\ZoneAlarmPro.exe /s /noreboot ECHO. ECHO Enregistrement de ZoneAlarm REGEDIT /S %systemdrive%\install\Apps\ZoneAlarm\za.reg I installed ZA on a VMWARE environment, without entering my registration information, executed the REG file and after a reboot I could use it fine. Rgrds, Alex