This message would be thrown at you at least one thousand times during the average DOS session. If you’re in the wrong folder, your paths are not set, or if you simply hit the wrong key, this message pops up and gives you a fresh C:/> prompt. It was a gentler time back in DOS. Sure, DOS took no crap, but it also didn’t get all in your face with it’s problems. If it was ever overwhelmed, it simply hung, silent and dignified.