Sanza Fuze Malfunctioned

My sanza fuze 4g is malfunctioned it won,t pop up on the computer like it suppose to be (it says that USB NOT RECOGNIZED) i uninstall, it the same problem. I even try to change the usb mode still doesn’t work and i also formated the device and try to update it but it says the device is unknown and already updated. i don’t know what i’m to do next

I know you have tried some of these steps already, but do them in the order here, slowly and carefully.

Also, it might be something as simple as your cord–but you’ll have to buy or borrow another one to check that. 

Connection Troubleshooter