Sansa e260R

every time i plug my player in (sansa e260R) my computer says it doesn't recognize it but iv had it for about 5-6 months and its been fine. my mp3 player says there is nothing on it but computer says its full and wont let me add anything because it says there is not enough space but i cant delete anything because the things that my computer says is on there wont come up and isn't really there, no videos, pictures, music, etc. They were there but i plugged the player in to charge and i unplugged it and everything was gone. I've tried to listen the the rhapsody channels but it says 'connect to ur PC to transfer' in white letters.