USB 802.11g Wi-Fi adapter that's compatible with Windows XP 64-bit

USB 802.11g Wi-Fi adapter that's compatible with Windows XP 64-bit

Does anyone know of a USB Wi-Fi adapter that is compatible with Windows XP 64-bit? It must support at least 802.11g and Cisco WLAN extensions. Due to the specific hardware it must be USB and I cannot upgrade to Vista or 7 64-bit. I haven't had much luck with searching on Amazon or Newegg. Thanks