Game Crash on Large

Very disappointed got a good large game going, and it crashes everytime.  I know I don't have a decked out computer but this game is all but unplayable, in fact yesterday it overheated my video card and my whole machine crashed.  Seriously I like the game it has some good potential, but a pretty game does not mean playable.  Should have even MOM is still a better playing game in Dos Box then this game is at the moment.