You have to go up one directory level from public_html to /home/yourCPanelUserName
You should see a directory .fantasticodata (you have to have hidden files visible)
See if you have a file named installed_in_root.php
If you do, rename it to something else, like OLD_installed_in_root.php
I would do the same to a directory named WordPress in .fantasticodata
That should clear it up. I prefer renaming files/directories instead of deleting them because you can undo a renaming, you cannot undo a delete.