Do you use a firewall? It's a piece of software that helps your computer block unwanted traffic from your network. Generally speaking, antivirus software isn't enough to keep you fully protected. A firewall helps block security holes and it keeps random and bad traffic out of your machine.
Windows has a built in firewall solution, but there are a lot of other free solutions, and paid as well, out there. There are also hardware solutions, and your wireless router in your house probably has its own firewall built in. You're probably familiar with Windows firewall because if you don't have it turned on it nags you until you do.
And really, you should have it turned on. A quick Google will turn up other free firewall solutions, and maybe that software offers some functionality that you need or prefer to Windows. But short of that, even if Windows isn't the best, I'll equate it to one of my earlier posts on Microsoft Security Essentials. Even if it isn't the best solution, it offers enough protection that the residual risk is minimal and probably acceptable for most consumer users.
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