This document provides step-by-step instructions for disassembling and assembling a personal computer. It begins with 10 steps for disassembly, such as unplugging all cables, removing screws from the case, and taking out components like the power supply, hard drive, and motherboard. It then describes preparing to assemble the computer, including taking inventory of parts, downloading necessary drivers, and taking anti-static precautions. The assembly steps include installing the CPU, heat sink, and other components in reverse order of disassembly. Proper preparation and following the order of steps is emphasized for a safe and successful installation or upgrade.