This document provides step-by-step instructions for formatting a PC and installing Windows XP or Windows 7. For Windows XP, it describes changing the boot sequence to boot from the installation disk, deleting existing partitions, creating a new NTFS partition, and formatting and installing Windows XP. For Windows 7, it notes the installation process is easier and more graphical than Windows XP, describing loading files and setting language, time, keyboard preferences before formatting the disk and restarting for installation. The document aims to explain the full formatting and installation process for both Windows XP and Windows 7 on a PC.