Restart Game Progress

You can clear your game progress by going to:
C:\Users\YourUserName\AppData\Roaming\RenPy

If you are not finding the AppData folder, copy the directory and paste it where the arrow is pointing. (with your user name)

And delete the PigmalionAngel folder.

Then go to the game folder and delete the saves folder.

Now see if your game is reset.

If that doesn't work, you've lost Samantha forever : D