Every day and sometimes twice a day my firewall says a person tried to get on my computer with a Back Door SubSeven Trojan Horse. Now I have no clue what this means. It says I do not have to do anything because the firewall stops it. But I'm a little paranoid. What should I do. I have no clue why this would be happening to me. I really only read message boards. Any advice? Oh, I have the Norton Firewall.