I have seen such things with other adapters...had bought several netgear wgt301's a few years back, same store at same time, and when I tried to install an updated driver some months later, it only worked for 3 of the 4 adapters.
That 4th adapter just would not digest the updated driver for some reason. It worked fine with the original driver, and oddly, it worked again with the 18 months later updated driver, but that middling update was just un-digestible for it.
Go figger.
Also, You might check for a driver from teh actual DGE's chipset maker, maybe its an Atheros ?? I had to do that with my DLink card Extreme N PCI 3 antennas (brain fart on model number here)...The Atheros generic driver worked fine, but the DLink included driver would not....that was with XP pro 32bit.