I have the same driver and utility installed on my old powerbook which has Belkin WiFi PC card, I bought it as a replacement for one that broken by my son.
Belkin previously used Broadcom chips which are supported by Airport software, but switched to Realtek without changing the model number.
How many hardware guys does it take to change a light bulb? "Well the diagnostics say it's fine buddy, so it's a software problem."