Ralink Wireless LAN USB driver Windows 7 
I bought the Ralink USB wireless LAN from a Chinese website, which came with a mini disk CD, and that had the drivers but I lost it so… Now I have found it.
One link to the driver is: http://api.viglink.com/api/click? 
Or if that does not work then here is the zip i downloaded of the cd and it worked for me. 
