Live Update keeps interrupting me

I am getting very annoyed by LiveUpdate. It keeps running while the computer is active and is making everything veeeerrryyy sloooowwww. Sometimes it starts a new update just 5 minutes after finishing the previous one, so it is churning my hard disk almost continuously. I cannot open Outlook without turning Norton spam filter off. If LiveUpdate was a person it is being very rude, and I would have kicked its teeth out some time ago. Is there a solution apart from turning LiveUpdate off forever? There does not seem to be an option to force it to only update every few hours (or days). Thanks for any suggestions.