The easiest way to figure out what is going on is to try the adapter on a different computer. If it is still good it will be detected. Usually when a usb device fails it may be recognized or is recognized only as a usb device but it will not work. You don;t have to install any drivers just to test this on another computer unless you want to make sure it is fully functional. It is also possible that the usb ports on the computer are not working or one isn't. Simpley use on of the other ports.The usb port controller usually operate a pair of usb ports so try all the ports. You may get a problem with one port or pair but rarely all at the same time.
I think you will find that the adapter itself is your problem and will probably need to be replaced.
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