As I said, nobody has ever reported that kind of a problem before, and I can't imagine why the game is behaving that way. If all of the savegame files have been deleted, Plant Tycoon should not be able to do anything but start a new game.

We would be happy to replace your game with our own version, at no cost to you. All you need to do is go to our Support FAQ and click "No" on the page that I linked you to. Please provide your full name, as well as the details of your purchase (date, order number, etc.), as well as a description of the problem as you have described it here, along with the recommendation that you try our version.