This chapter discusses advanced operating systems topics, including selecting, installing, configuring, optimizing, upgrading, and troubleshooting operating systems. It focuses on Windows 2000 Professional, Windows XP, and Windows Vista. The chapter objectives are presented, along with critical concepts, activities, new terms, and changes from the previous version. Activities include advanced installation, partitioning, customization, scheduling tasks, restoring, and troubleshooting labs for Windows XP and Vista.