Hello Rrazzaq, and welcome to Eight Forums.
These would be thumbnail previews of these images, so see if resetting the thumbnail cache may be able to help.
Thumbnail Cache - Clear and Reset - Windows 7 Help Forums
Windows 8.1 pictures are stripped in the small preview so i can't see what i'm opening until i've opened it. It is fine once it is open just when it is smaller?
What happens if you open a picture in paint and save it.
What happens if you open a picture in paint and save it.
There are too many pictures to do this with.