MY MP4 PLAYER

I AM HAVIN A PROBLEM WITH MY MP4 PLAYER. I HAVE NO FILES ON IT AT ALL.WHEN I GOTO THE MEMORY ON IT ITS SAYING I HAVE USED UP 70% OF MY MEMORY.WHEN I CONNECT TO MY COMPUTER THERE IS A FOLDER ON IT WHICH HAD MP3 FILES ON IT BUT THERE IS NOTHING INSIDE THIS FOLDER.WHEN I GO TO DELETE THE FOLDER ITS SAYING ACCESS DENIED CANNOT DELETE.WHEN I OPEN THE REMOVEABLE DRIVE THE PIE CICRLE ON THE LEFT WHICH TELLS YOU HOW MUCH MEMORY IS LEFT AND HOW MUCH YOU HAVE USED SAYS 335 MB USED.HOW CAN THIS BE WHEN THERE IS NOTHING IN THE FOLDER.I WILL LEAVE YOU THE ADDRESS SO YOU CAN HAVE A LOOK WHAT MP4 PLAYER I HAVE.IF ANY I CAN HELP I WILL BE VERY GREATFULL ALL IWANT TO DO IS DELETE THIS FOLDER SO I HAVE ALL MY MEMORY BACK......http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=9718396799

I tried a sd card in my mp4 to save pictures, but its not saving. Can anyone help?

I brought the mp at a computer show.

hello