If you go into the file they are stored in and click on the picture, it should open up with a now of symbols underneath,
There should be one that is like a little landscape pic (second from the right on mine),
Clicking on that should open it up in paint.
Once in paint click on Image, from menu select stretch/skew,
Reduce the percentage in the horizontal and vertical boxes to say 50%, do both the same or it goes wonky,
Save pic once this is done.