No, Norton is dead. If those anti-virus companies would make software that doesn't kill your CPU and RAM then more people would use them. I haven't used Anti-virus since 9 years ago. It started when I didn't have money for them. Then I decided it was not necessary if I knew how to use my computer and watch out for sites to visit... especially porn sites.
Now with Firefox + adblock + noscript, it's really dead.
A few additional risk vectors:
* Flash memory sticks that get plugged into not-my-computer. For example, I have Office Max print for me occasionally. Plus, I handle minor PC issues for my mother-in-law.
* A network shared with any other living person (because dead people never accidentally hit the wrong web sites)
* A network shared with enabled devices that auto-cruise to web sites (this hasn't been a big problem yet, but the potential is real)
* Ancient relatives who believe forwarded email is a blessing. If you have this problem, insist they get on Facebook with their own account. Then they won't have time to be lonely. Plus, I'm not on Facebook.
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