|Well, it's years since I used Norton but as I recall it Backweb was the system that they used for updating. It is possible however that other third party programs use this too. Short of uninstalling & re-installing Norton I have no answer. Possibly Backweb appears in "Control Panel > Programs and Features" in its own right. There is probably a Norton-Symantec forum if you Google around and they might be able to help you to first make certain that it really is a Norton issue and provide a fix.|
You might prefer to stick with Norton but the following freebie AV's work very well:
Microsoft Security Essentials.
Someone else on here might have some ideas if you keep looking back.
Sorry but that's about all I can personally offer on this issue.
Please come back and let us know how you got on.