Running iTunes 12.4.2 under Win7 SP1. Recently, something happened so that selecting any song gives me "The song ... could not be used because the original file could not be found. Would you like to locate it?" The location attempt inevitably gets me nowhere. Can I recover from this? Right now there are a few thousand songs in the library, but I'm going to start over with a new empty library, and (for starters) keep only a hundred or so of the original set, but I have to find out how to retrieve them from the old dysfunctional library. FWIW, I have an adult daughter and four grandkids who like to charge their phones/iPods using a USB port on the PC. If iTunes happens to be running when they connect, it starts a synching operation that may get aborted. Their attitude is "it doesn't seem to hurt anything" when that happens. I'm skeptical about that, and looking for your opinions.