I really need some help with this. I deleted some pictures off of my Tour and I thought they were gone forever. However, as I was looking through my media files I noticed the thumbnails were still there. When I click the thumbnail, I can't open the files. I tried to delete them and it says ("The file is read-only, are you sure you want to delete") I click yes, but the image does not disappear. How can I make these thumbnails go away???