Window explorer throws the page off screen

     I'm having trouble on figuring out when Windows Explorer throws the page off to the right and no matter what I try I can not get the page to show on the screen. This doesn't happen often, when it does the only way I found to get the thing to work right is to use system restore. Is there another method to use bsides this?? Why is it doing this?? I'm not a computer whiz, so any answer must be clear so even an old man like me can figure it out..