I assume that You’re running in MTP (media transfer protocol) mode? Try switching to MSC (Mass Strage Class) mode, where it emulates a flash drive. If you are running the first mode, you’ll notice that in “My Computer”, you will see one mp3 player icon. When you click it, there will be two memories (internal and external). In the second mode, you will see two icons in my computer, each appearing as a flash drive (for example, the internal memory might appear as drive “E”, and the external “F”, although the letters will very).
Having said that, if one mode fails, I might try using the other. In fact, if you can get one mode to work, maybe you should consider using it to reformat the internal memory. That might clear out what ever is causing this error. Otherwise refer to this link on how to re-install your firmware. That also might help.
