This sounds like the same problem I had, which I believe is refered to as hyper-threading. Are you running the game on XP? Try following this thread
Originally Posted by tick5tock
I am just afraid if I don't save the game will stop working.
Don't worry about this, being able to save has nothing to do with the game working. Being unable to save makes you have to play through the whole game in one sitting, but it isn't going to damage the program or anything