How to Reset the Wireless LAN on Windows XP
Windows XP includes a feature that allows users to automatically repair and reset any network connections. The repair function can be accomplished using the Control Panel's Network Connections. Resetting a wireless LAN connection can also be done using the command line.
Click the "Start" menu, then click "Control Panel." Select "Network Connections."
Right-click on the wireless LAN connection and select "Repair" from the context menu that appears.
Allow Windows XP to diagnose and repair the issue. Then retry connecting to the wireless LAN connection.
Click the "Start" menu, then select "All Programs." Click the "Accessories" sub-menu, then select the "Command Prompt" icon.
Type "netsh int ip reset c:\ network-connection.log" into the command prompt window and press the "Enter" key. This will run the Netsh utility, and a report log will be stored in the network-connection.log file.
Type "netsh int ip" into the command prompt and press the "Enter" key. This will reset the TCP/IP.
Type "netsh winsock reset catalog" into the command prompt to reset the socket that manages the TCP/IP. This is only available on computers with Windows XP Service Pack 2 installed.