The original script to install Symantec Client Security 2.0 will not execute in a silent installation.
Original script
msiexec /i "Symantec Client Security.msi" WSCAVALERT=0 WSCFWALERT=0
setup.exe /s /v" /qn INSTALLSERVER=0 MIGRATESETTINGS=0 REBOOT=ReallySuppress"
Modified script
cmd /c SCS.msi /qn LIVEUPDATE=0 MIGRATESETTINGS=0 REBOOT=REALLYSUPPRESS