Photos Stretch in Show Mode

[Grosos]

I am running Powerpoint 2007 on a PC with Windows Vista Home Premium. While in edit mode, the slides (and the pictures on them) display normally. When I press F5 to start the show however, the pictures stretch horizontally, to the point that at least half of the picture extends off screen. In order to view any powerpoints I have view them in edit mode. I do not know whats wrong at all and I have tried both changing the resolution of my computer's monitor as well as the resolution for the show within powerpoint. A couple of months back it was working perfectly and now this problem is presenting. Any suggestions?

[John Wilson]

Are you sure that the images are not just bigger than the slide? This won't be obvious in edit mode

[Grosos]

Yes, I am sure the photos are not larger than the slides. Even if I type text onto a new slide and then play the show, even the text extends off the screen.