purchase. The 30 day trial has expired and a message flashes "your trial has expired. Urgent to renew." Yahoo security uses Norton Antivirus and Firewall . Do I need to subscribe to the message from Norton to renew/upgrade or am I still completely and safely covered by Yahoo's Antivirus and Firewall protection sponsored by Norton?Thank you for the quick response. A detail -- my connection to the internet is through AT&T/Yahoo and Yahoo security uses Norton security for filtering email. The question is "do I still need to respond to the message directly sent from Norton to upgrade /subscribe? Am I am presenting my delemma clearly?