If it ran out a year and a half ago it's basically useless at protecting you so I would uninstall it. You can always return to it on your account page if and when you re-subscribe. Meanwhile I would look for something free to use in the interim.
I have to agree - we are currently finding 150,000 new viruses EVERY DAY. If you're not updating the software, it's not going to be looking for the current threats - might as well remove it.