Reactivation and full system scan

My account is paid up until Mar, 2009, but I get pop-ups that say I have to reactivate.  I got a pop-up that says I need a full-system scan, but when I click on ‘tasks and scans’, nothing happens and I haven’t been able to get the scan.  I would like to do a full-system scan.  I don’t like seeing the red ‘X’ on my Norton button.