Hello! Seems like not enough ram memory. I suggest closing all the applications except windows/MacOS and run the game only. If you use windows 7 than I suggest run the game on another PC with win 8 or higher. Also there are might be another pc problems. May be cleaning pc or antivirus programs will help to solve the problem.
I wish you best of luck! If anything will help please tell me, if nothing will help also please tell me, and we will try to find the solution.