I had the same problem with that card. By default, most of the functionality of the AR5B93 is not enabled. I found custom drivers for this card. The driver file version is: "atheros_v9.2.0.105_v1.31". Forgot where I got it from, but,
I will upload a copy of the modded drivers for you.
Download here: http://www.megaupload.com/?d=WOE6P960



