MP5 "crashed"

I have a Panasonic SV-MP510V. I deleted all music files on the weekend intending to update new songs. However, now when I turn on the MP5 it comes up with "NO TRACK PLAY" and when I try to sync with my laptop it comes up with a window which says "FM Radio" and behaves as though it is searching for a file/folder. It then opens up my Removable Disk F: folder but I do not have the folders I previously had for My Player, Temp and FM Radio. I cannot sync at all and when I "remove" the MP5 from the laptop connection it freezes. Your help would be really appreciated!