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Some file scanning software products that are not made by Apple, such as the Sony VAIO Entertainment Platform, may damage your iTunes library. If the library becomes damaged, iTunes may create a new, empty library.
Although the library appears empty, the media files should still be in their original locations. By default, this would be the iTunes Music folder. For more information on iTunes files and folders, please refer to the following articles: What are the iTunes library files? and Where iTunes for Windows stores your audio files.