Here is simple way to connect to wireless network in Windows XP using its built-in wireless configuration tool:
 

1) Go to Start and click on Control Panel.
 

2) Control Panel window will appear. Double click on Network Connections.
 

3) Network Connections window will appear. Right click correct Wireless Network Connection by identifying correct wireless network adapter and click View Available Wireless Networks.
 

4) Wireless Network Connection window will appear. Select the network you wish to connect and click Connect.
 

5) If the network is one that supports Wireless Provisioning Services, such as a public wireless network or a corporate network, you might be asked to download additional files that will allow your computer to connect to the network.

- If the Web site listed in the dialog box is one that you trust to provide you with this information, click Download. Otherwise, click Cancel and choose a different network to connect to.

- Once the files are downloaded (or if they were previously downloaded), follow the instructions in the Wireless Network Registration Wizard.

6) If the network you choose is security-enabled, means require authentication. One of the following will occur:

- If the network key is automatically provided by your network or system administrator (that is, the network supports IEEE 802.1x), the connection will be made automatically.

- If the network key is not automatically provided, type in the key.
 

7) You will connect to wireless network at last.