I agree with Ted. When I take photos, sometimes horizontally, and upload them to my Easy Share file, I generally look at them and see if they need to be lightened or perhaps rotated. If the picture(s) present sideways (rotated), I just rotate it until it is straight. If I do that before they go into my pictures library (enhance/rotate), those changes will always be permanent. However, if I forget to enhance/rotate, they will then go into the library presented sideways. I can rotate them in the library and though it will remain "straight" there, IF I upload those pictures to ATP/NGA, they will revert, and present sideways. When I see that, I have to go back to those pictures in the library and rotate them opposite of what's shown on ATP. Then when I upload them, they will be straight. For example, I uploaded a photograph to ATP and it presented sideways, rotated to the right. I went back to my Pictures Library, located that picture, clicked on "Edit", and then rotated the picture to the left. I saved it and then uploaded it back to ATP. It is now straight (vertical).
I am using Easy Share by Kodak and other programs won't respond the same way. My description is probably hard to understand, but doing it (straightening a rotated picture) is quite easy.