If your USB drivers are working correctly, when you plug a device in, Windows will normally go find a driver or give you a message about how the driver could not be found/installed.
I would trying using Device Manager to remove the device (it needs to be plugged in). Then Windows should find it again and you can start over. I will have to assume the errant device is not shown in device manager if the USB device is unplugged?
You might get us a picture of your device manager with the errant device showing and expand your USB section so we can see it. Use the snipping tool and attach using the paperclip on the advanced reply.