As soon as you connect your computer to the Internet, or even when you install new software, you risk being hacked and infected with viruses. But you already know that.
You also know that in order to protect your computer, you need at least three things: a firewall, an antivirus and an antispyware. But did you know that you can have all three software tools for free? Here is what I use on my Windows XP:
What do you use?