Once you stop playing, the background scare moments should stop as well as they use a timer system that closes them eventually. These also only occur if the game is being played. There is one known bug where sometimes the laughing sound system won't close when programmed to if you collect a music box. In task manager you can manually close it by finding and terminating the process called "Microsoft ® Windows Based Script Host" or "wscript.exe" for short, logging out and logging back in should close it as well.