Just remember, if you get some crazy popup, especially when visiting a webpage that you've never been before, saying "YOU MUST HAVE A VIRUS CLICK HERE TO DOWNLOAD THIS RIGHT NOW OR YOUR COMPUTER WILL SELF DESTRUCT IN FIVE SECONDS" or something to that effect, and the message is NOT coming from your already installed AV software, it's BS and don't fall for it! And if you don't have up-to-date AV software installed surfing the net, you might was well be in a whorehouse without a condom. There's some good free AV software out there that is well-respected (AVG for one).