This report delves into the fundamental aspects of computer systems, exploring their roles in various environments like hospitals, schools, transport, gaming, and hotels. It provides a detailed breakdown of hardware, software, and peripheral components, comparing different types of computer systems based on their size, expense, and processing capabilities. The report further outlines system design specifications, installation procedures, and routine maintenance tasks, including data backup, defragmentation, browser history cleaning, antivirus updates, and service disabling. Finally, it discusses hardware and software upgrades for enhanced performance and security.