Please Understand wireless network settings and setup:
Wireless networks depend on special-purpose radio receivers and transmitters that substitute the exchange of messages over the air for the exchange of messages that occurs over wired connections on conventional networks. When you power on your PC, Windows Vista automatically searches for available wireless networks.
The network icon in the system tray, shown in Figure 1, enables you to view a list of local networks that Windows Vista detects. Notice that the network icon in this figure is marked with a red X, which indicates no network connection is currently established.
Figure 1: A red X indicates no network connection is active.
When you click this icon, a window opens indicating you're not connected to a wireless network, as shown in Figure 2.
Figure 2: The detail window for the network icon provides a link to create a network connection.
The window also includes two hyperlinks: Connect to a network and Network and Sharing Center. Click the Connect to a network
link to open the Connect to a network window, shown in Figure 3.
Figure 3: Connect to a network window.