Refresh Database

So my e280 has been working fine all the time i’ve had it.  But my father got an mp3 and plugged in his mp3 and then my e280 and tryed to copy my music folders to his mp3 and when i came back from school and looked at my mp3 half my songs are gone and everytime i turn my e380 on a green box appears and says refresh database and my golist keeps emptying on it’s on. i don’t know how to fix this so can someone help me PLEASE:)