Hair crashes

Next to the final, when I made the hair system, then making some test, saving... The next day I changed some things of the hair and when I saved the scene I couldn´t open the file, this happens when I add some more follicles, when I change the rest position curves, if I change into maya renderer, (when I press any key of the computer). So I am thinking about getting back to the original concept and model the helmet or mayb I should continue with the hair of the character withouth any changes?

I desired It to be like this (see image above), but this version also crashed :(

So much time invested into this char...