John,
As an alternative, you may want to have a look at an external wireless Ethernet bridge (also known as a gaming adapter). Such a device is connected to the Ethernet port of the computer. No special drivers normally needed. The bridge can be used under almost any operating system. A few examples: Belkin F5D7330, D-Link DWL-G810, D-Link DWL-G820, Linksys WET54G, Linksys WGA600N and Netgear WGE111. Study the specifications. Not all units or variants support WPA security (a firmware update may be sufficient in some cases).
Jan