This happened to me recently and at first I had absolutely no idea what was going on, but I looked into more and found that the solution was easy.

Basically what happens is that in an explorer folder it shows the files icon but does not show the name, so I had a bunch of similar icons with no names.

What the problem here is that Windows believes you have set the folder as a pictures folder and selected to hide the files names. I have no idea why this happens (unless you have selected that option), but the fix is quite easy;

  • Navigate to the folder
  • Right click and select customize this folder
  • Click the customize tab
  • In the top dropdown select pictures and videos as your folder type
  • Apply and OK
  • Now back to the folder and select view (you may need to hit alt first)
  • Uncheck hide file names
  • Your file names should be back again