Windows Operating System is the Seventh chapter that has been added in the syllabus of Computer Science ICS-I (Intermediate Part-1). Today, Computer Science is widely used in almost 99% of the organizations and its importance cannot be neglected today. After the introduction of Computers, the business world changed forever. Almost 99% of the businesses today use Information Technology to ensure their departments run smoothly. Information Technology is widely used today in the core departments of all the organizations like Human Resources (HR) / Personnel, Finance, Budget and Security. In this chapter the students will learn about the Introducing GUI operating system, OS components and selection techniques,Use of GUI components of operating system (WINDOWS), Basics of file and disk management and Printing in GUI and print control jobs.