Somehow, when I was trying to work on my desktop background, I cannot remember what I did, but there was a screen that said, if right-handed...blah, blah, blah; and if left-handed...blah, blah, blah, and the left-handed box was checked. Well, I did not read the entire screen as to what I was doing, but because I am right-handed and the left-handed box was checked, I unchecked the left-handed button and pressed the right-handed box. When I came out of this screen, somehow my desktop was sideways. I called my Internet provider and they could not help me except by telling me to try hitting control, alt and my arrows to turn the screen. This did not work because it came through some program. I am on disability for cervical nerve damage and cannot read a sideways screen and am having extreme difficulty trying to find what I did. Currently I am on my daughter's laptop to write this message because I am hoping someone can navigate me how to un-do what I did?