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#11
Go to Device Manager and locate the device there.
Right click on it and select "Properties"
Then select the "Details" tab
In the dropdown box, select Hardware ID
As it's a USB device you'll need to find the 4 characters immediately after the VID_ and the 4 characters immediately after the PID_
Then you can look up the device manufacturer and model at http://www.linux-usb.org/usb.ids
Once you find that, then go to the network device chipset manufacturer's website and locate the driver there.
I found this at the Belkin website (it's a Vista driver and it appears to be from 2009) Belkin : Support : F5D7050 Wireless G USB Network Adapter - Drivers
FWIW - there are known issues with some versions of the x64 RaLink drivers - so determining the maker of the chipset will help in determining where to get the driver from.