whenever i try to save a scene that ive made it brings up an error message and the game crashes.

then afterwords whenver i try to play the game, it will either go halfway through the loading list and crash, or just crash right there on the spot.

and then i have to re download the game into a folder.
any help would be appreciated.

Pay attention to the error message: It tells you, if often vaguely, what the problem is about.