Or if you enjoy the hard difficulty but fancy cheating a bit by still being able to save, u can always go into the saved file in "my documents" and move/delete the existing saved file whilst your playing the game by pressing alt+tab. The use alt+tab again once this is done to tab back into the game and after un-pausing and re-pausing you will be able to save a fresh file again!
A bit long winded, but its helped me get through the buggy game, as the frustration of it crashing every five minutes got too much! :D