Can't view pictures in photo gallery

Hi. I have Windows Vista Home Premium SP1. Whenever I double-click on a
picture to view it in the photo gallery, I get a blank page with an error
message that states something like "This picture can't be displayed. You
might not have enough memory available. Close some programs, or if your hard
drive is almost full, free some disk space and try again." I know this isn't
correct as I have a new pc with 2 gb ram and very few programs installed. I
am, however, able to view pictures as a slide show. I have had this problem
every since I got this pc, even before installing SP1. Thanks for any help
with this.