Hi All, I keep getting this message on my Mac. I am a very novice computer user. I do the basics, email, itunes, facebook, and online classes. That is about the extent of my computer usage. I keep getting an message on my computer that says, "Your Mac OS X startup disc has no more space available for application memory. To avoid problems with your computer, quit any applications you are not using. Close windows and removing files from your start up disk will also help." Then it list the applications that are open. So, I close out all of the applications and in 5 minutes the message comes back. I don't know what to do next. Someone please help me!