what you should do is instead of updating thru LiveUpdate use the Norton Intelligent Updater.
it downloads the virus definitions as a setup file and you can keep the setup file and use it again later.
one bad thing though is that the intelligent updater is only for virus definitions, not other updates.
u can get it from their site.
the latest one (nov 2) is here - *securityresponse.symantec.com/avcenter/download/pages/US-N95.html