The WG311v2 uses the ACX100 chipset I believe, in which case
http://www.houseofcraig.net/acx100_howto.php gives all the instructions that you need. It's a bit more complicated than the previous poster suggested, as you need to install drivers for your card first, as well as update the firmware. It's not too complicated if you follow it through step by step, and the files you need are also outlined in the above link.