Disable Peer-to-Peer (Ad-Hoc) Wi-Fi
One of the most common Wi-Fi security dangers comes from malicious networks, called "ad-hoc" Wi-Fi connections, that emanate from other computers. For example, a hacker can sit down in an airport and start broadcasting an SSID called 'Free Wi-Fi', which your Wi-Fi adapter may automatically connect to. Or you may inadvertently click it, thereby giving the person access to your computer. Since most people rarely need to connect directly to another computer via Wi-Fi, it's best to disable this feature. In Windows XP, open the 'Network Connections' Control Panel applet, right-click your wireless adapter, and choose 'Properties'.