Wireless Infrastructure Mode Configuration for Windows XP SP2
Click the Start button, and then click Settings and Control Panel.
Under Pick a category, click Network and Internet Connections.
Under or pick a Control Panel icon, click on Network Connections.
Right-click your wireless network connection, and then click Properties.
The Wireless Network Connections Properties box will display three tabs at the top: General, Wireless Networks and Advanced. Click on the Wireless Networks tab.
Click on the Advanced button located near the bottom of the box. If only General and Advanced tabs are available, Windows is NOT managing your wireless card. Ad-hoc networking must be disabled using the management utility that is associated with your wireless card.
Select Access point (infrastructure) networks only.