I have used these cmds in runonceex forever. works every time.
REM ZoneAlarm Pro
REG ADD %KEY%\160 /VE /D "ZoneAlarm Pro" /f
REG ADD %KEY%\160 /V 1 /D "%CDROM%\Apps\ZoneAlarm\zaSuiteSetup.exe /s /noreboot" /f
REG ADD %KEY%\160 /V 2 /D "Taskkill /F /IM zclient" /f
REG ADD %KEY%\160 /V 3 /D "REGEDIT /S %cdrom%\Apps\ZoneAlarm\ZaPro.reg" /f
REG ADD %KEY%\160 /V 4 /D "REGEDIT /S %cdrom%\Apps\ZoneAlarm\ZaPro1.reg" /f