How do I connect to a wireless network in Windows 7?
To view and connect to available wireless networks
Open Connect to a Network by clicking the network icon ( or ) in the notification area.
In the list of available wireless networks, click a network, and then click Connect.
Some networks require a network security key or passphrase. To connect to one of those networks, ask your network administrator or Internet service provider (ISP) for the security key or passphrase.