Actually, I've used the informations contained in the MSI_FAQ.txt in order to have a silent Installation, but it crashes with error... I have to recheck my commandline. A patch exists for SAV9, but it is in .MSP format, so I don't now how to install it. Maybe we can slipstream it... I need help for this Here is the link : http://www.symantec.com/techsupp/enterpris..._9.0/files.html For the virus definition, simple download the lastest Symantec Security Responce Intelligent Updater and run it with the /Q- switch. (downland the x86 and not the i32 version) Here is the link : http://securityresponse.symantec.com/avcen...s.download.html