Strange symbol Folders on Clip Sport

I am having a bit of trouble with my Sandisk Clip Sport. When I plug it into my laptop and click on the icon for it. A bunch, 100 or so, files show up with unreadable symbols. All the files show they are empty but when I click on them a message pops up stating "The filename, directory name, or volume label syntax is incorrect ". It will not let me delete all these files/folders off of the Clip Sport. Can you help? Thanks, Clint

Ok, I figured it out somewhat. I had to go to settings and format or restore factory settings and now all is well.