There are a lot of driver updates on the Ralink page. What is the correct one? I have a WLAN USB Antenna TC12W2 and OS Windows 7 64bit. Which driver do I need?
Since this is a 30XX series chip, you will need to download the first driver on the Mediatek (Mediatek acquired Ralink) page: http://www.mediatek.com/en/downloads/
Click on the USB (RT2870/ RT2770/ RT307X/ RT2070 RT357X/ RT3370/ RT8070/ RT5X7X/ MT7610/ MT7601/MT7612U) link and then follow the procedure. Fill the form and the download should start automatically.