BOOK DESCRIPTION This book Computer Hardware Essentials is designed to provide practical guide and approach to Computer Hardware and Software technicians and students. Students will find this book very useful during practical class. The author, shall neither liability nor responsibility to any person or entity with respect to any loss or damages arising from the information contained in this book. This book which is the second edition will be found extremely useful by all technicians and students in faculties of management, Social and Physical Sciences in Nigerian Universities, Polytechnics and Collages of Education as well as those interested in the fascinating and dynamic world of Information Communication Technology whether they are in public or private sector of the economy. This book is made up of six Chapters, which are Identification of Computer, Computer Assembling, Microsoft Windows, Preventing Maintenance and Troubleshooting, Computer Networking and Network Security. These chapters are also designed to make students excel in Computer studies. An alternative title of this book is Computer Hardware Essentials Practical guide as it is self-explanatory with review questions and illustrations.