I have Movie Studio 15.  I am new to both it and making videos.  I have a project that was video with graphics and music I planned to put on Youtube.  It was basically done, with just a few additions to be added.  My C Drive (where the folders were located) was nearly full.  I moved all the video to my D Drive to free up space.  I planned to pull over whatever I might need for the project back into C Drive for more editing, as needed.  Having done this, when I launch Movie Studio, my edited work seems gone.  I get a message, it can't find my program: despite my putting the original work back in the C Drive folder I was using previously.  Have I lost my data?  Any ideas on my situation and what I might do?

Thank you