The Encarta 2004 Reference Library PC is a comprehensive educational software package produced by Microsoft. It includes a collection of encyclopedias, dictionaries, and other reference materials in English language, accessible through a CD format. This product is compatible with Microsoft Windows XP, Windows 2000, and Windows 98 operating systems, and is licensed for use on one device. The Encarta 2004 Reference Library PC is a valuable resource for students, educators, and anyone seeking reliable information on a variety of subjects.