Software seemt to stop working

Every few days I notice the Norton Gadget on my desktop that usually says 'SECURE'  suddently changes to a rotating circle. I run Norton and afterwards the result says there are errors and I have to uninstall and reinstall every time.  Is there something I am supposed to configure? I have gone over everything and I can't see. I've tried pin pointing a time or activity that would be the cause, but have found nothing.  I have windows 7 on an HP TouchSmart computer with Norton 10

thank you