It is easy to run your home wireless network with very little security and not feel any sense risk. After all, you don't feel exposed and unless you venture outside your home with a laptop, you may not be thinking very hard about who else has access to your network. You have to get used to the idea that now your network and any computers or other devices attached to it are accessible from outside your home. Hackers with plenty of time, just need to be close enough to be within range of your wireless signal, which can easily cover a city block with the newer wireless routers. There are some important steps you can take to reduce your vulnerability. A good list of these steps, with links to more extensive explanation and instructions can be found at About.com here: http://compnetworking.about.com/od/wirelesssecurity/tp/wifisecurity.htm