Ok that's suspicious of being plugged into a usb port that winusb doesn't recognise, such as a usb3 port. I suspect the earlier version of cgminer included a different libusb which probably did recognise it (though that libusbx is buggy in so many other ways which is why I dropped it). See if you have any usb2 ports anywhere or a usb2 hub to plug in and see if it's recognised. If it doesn't show up with cgminer.exe -n then it will never work.