Crysis crashing

my crysis keeps crashing before loadup sceen begins - i double click crisis icon or select it from menu to start game, after a few seconds my screen goes black as it does wen starting game, but before any actual loadup screens occur it crashes - i wait a few mins, ctrl alt delete and it claims crysis isnt responding. only just started doing this -any1 know why and how i can sove it?

iv tried reinstalling game and all my settings are on lowest as it is