This book is written for Engineering, M.Tech., M.C.A., M.Sc. (Computer Science), B.C.A, B.I.T., B.Sc., P.G.D.C.A. and other diploma course students. Part-A of the book presents Computer Basics, Windows and MS-WORD in a simple and easy to understand style. The subject matter thoroughly clears the doubts (it any) of both a novice or an experienced computer user. C++ is a powerful modern language that includes the power, elegance and flexibility of C and the Object Oriented Programming features. Its features are data obstraction, data encapsulation, modularity, inheritance and polymorphism. So it is the language of new era. Part-B of this book presents all the C++ programming topics from elementary to file handling with properly tested programming examples. Information Technology is a very vast topic and the book provides some introductory concepts about it. In the end an introduction of Internet and its applications is also discussed.