unable to view preview pictures (.jpg), gallery view works fine

One day Windows Photo Gallery just decided to not open pictures (.jpgs)
when I click on them. I can hit "go back to gallery view" and see that,
but still not just on single pictures. in order to see you have to hit
slideshow. so I know the program is not totally crashing because
slideshow works and gallery view works, just not viewing individual
pictures.

l haven't seen anyone else giving step by step instructions on how to
fix. Can you help?


--
laughlin