I hope this helps, DaskX. When I had this problem a few years ago, it was the driver. I wasn't using Backtrack, but when I installed "driverloader" from Linuxant, I was then able to configure my wireless (Linksys) NIC. I recommend you get a free copy of the driver, to see if it works, and decide if you would then like to purchase it (back then it was less than $20 per machine). I pasted a URL for driverloader below.