Buffalo Wireless LAN Adapter driver
I know this thread was created long time ago but non of the answers given worked for me. I spent some time to find the solution and I guess it will be usefull for others to post it.
I'll keep it short: HERE is the driver. It works for the next buffalo wireless adaptors:
If your model is not in that list then it will only work for you if your device chipset is the Ralink RT73, otherwise don't bother trying to make it work, because it won't.
It will work for the 32bits and 64 bits versions of Windows 7 and probably Vista too, altough I didn't try that.