This paper is about task manager we use in operating system, the existing task manager is difficult to use; as it do now provide multiple end task function. Task manager is the application that help user to manage the running application in order to optimize the computer performance. Simple task manager allow user to view and end multiple task, this allow user to optimize their tasks in an easier way. Besides, simple task manager also provided virus scanning, this allow user to scan the application to ensure it is not virus.