This book is aimed to provide basic information about internal components of a Computer and also how to assemble a Computer. This book covers how to assemble different components of the Computer in a step by step manner with diagrams. As operating system is essential to operate a Computer, this book explains the step by step procedure for installation of Windows and also Linux as a dual operating system. How to troubleshoot the hardware and software problems is also covered in this book. In the second part of the book, we have discussed on Internet, World Wide Web and also on Network connection establishment. In the last chapters we have included basic information about Browsers, Search Engines.The targeted readers of this book are undergraduate students who are new to Computer hardware and Installation of Operating systems.