Sorry for the misunderstanding there.
What do you mean by 'offline': can't connect to the internet, can't connect to the local network, or that they show up as 'offline' in the System Center?
Does using the Intelligent Updater have the same effect (http://www.symantec.com/business/security_response/definitions/download/detail.jsp?gid=savce, look for the file ending in -i32.exe)?
What is your computer's operating system?
Just so you know, the build you're using is rather an old one (from March of 2006, as best as I can determine). There have been a lot of fixes since that release:
Release notes for Symantec Client Security 3.1.x and Symantec AntiVirus 10.1.x
http://www.symantec.com/docs/TECH101820
I strongly recommend migrating up to at least SAV MR 10, or better yet, plan to migrate to SEP, which provides broader technology to protect against modern threats.
sandra