Upgrade WiFi minicard in Inspiron 17 laptop ?

Hello

I have a Inspiron 1764 laptop, which has a Dell Wireless 1397 WLAN Mini-Card.

The 1397 minicard meets G spec for Wifi (54 Mbps), is it possible to upgrade the Mini Card to one that meets N spec (300 Mbps) ?

If so, which part and is it easy to physically fit and will Windows 7 pick it up automatically ?

Thanks, Vultan