Somehow your save file must've gotten corrupted. I've seen this happen to a few people who only just fresh installed the game and I've no idea how it happens. But if you go to your Appdata\Local\AtC_BB\Saved\SaveGames folder and delete the .sav file, next time you boot up the game it should create a fresh save file and solve the issue. If you don't know how to get to your appdata folder, type %appdata% in your search bar and it should pop up.