I am running xp pro with sp2 on my home computer. I have a dsl and I am using a router with a built in firewal. My question is this, along with the router can i use the xp built-in firewall protection, or should I purchase a software firewall program. Whenever I go to symnatec site and check to see if I am safe the report comes back fine. I want to be safe, but don't want to spend the money If I don't have to. What should I do?