How do I keep text from changing from one slide to another?

I saved my slides to a file in My Documents and when I reopened the file and
looked at my text, it had moved to a different location on the slide and
everything was disorganized and now I will have to edit every slide. How do
I keep the text and graphics the same as I did it the first time. I do not
want to secure it as other people need to make their changes also.