Can you follow the instructions here to generate some Symantec Info (you don't have it in the Help menu in your version):

    http://www.symantec.com/business/support/index?page=content&id=TECH13476

I'll send a private message with an email address where you can send the zip or txt file the tool creates.

One question, in the meantime:  were you doing a manual scan when this occurred, and if so did you include any Time Machine volumes?