Get from Amazon.com : http://www.amazon.com/gp/product/B00009X6PH?tag=hawaiianlegac-20
Cisco-Linksys WUSB54G Wireless-G USB Adapter
Connects your desktop or notebook to a wireless network at up to 54 Mbps when used with a USB 20 port
Easy no-tools setup on any desktop or notebook
Also compatible with Wireless-B networks at 11 Mbps
Wireless communications are protected by up to 128-bit data encryption
Compatible with Windows 2000 or XP