Publisher 2013 save error

After completing my work using Publisher 2013 (the preview edition), I closed the window. When it asked me if I wanted to keep my clipboard, I said no; and then it asked me if I wanted to save any unsaved changes before closing, and I said yes.

After the save was completed and the window closed, I reopened the file, but instead of leading me to where I left off, it gave me the "This file has a problem it might kill you. Open only if you can trust the source" popup, and of course, I told it to proceed. However, what I got was a "Publisher cannot open the file" error popup. It only has the OK button, and if I press it, Publisher would exit itself.

Because I cannot open the file I can't access previous versions of it either........I need this file for a presentation at the national science fair.............help???

 

Window 7 Home Premium K, SP1, btw