A computer system consists of hardware, the electronic devices capable of computing and manipulating information, and software that carries out predefined instructions to complete a given task. The combination of physical equipment and logical instructions gives power and versatility to the modern computing systems. Systems software consists of several programs, which are directly responsible for controlling, integrating and managing the individual hardware components of a computer. The purpose of system software is to insulate the applications programmer as much as possible from the detail of the particular complex being used. It includes an integrated systems of programs, which manages the operations of the processor, controls and provides manages storage resources and provides various support services. Some common examples of system management programs are operating system, device driver and system management programs are operating system, device driver and system utilities. It consist of programs which controls, coordinates and supervise the activities of the various components of a computer system. These programs perform tasks related to the maintenance of the computer system. These are the packages which are loaded into computer during time of installation of operating systems. They are used to support, enhance, expand and secure existing programs and data in the computer system. It increases the amount of information that can be stored in a hard disk by compressing all information stored on a hard disk. This utility works automatically and the user does not need to be aware of its existence. It detects computer files whose contents are need to be aware of its existence. several locations on the hard disk and moves the fragmants to one location to increase efficiency. It can be used to rearrange files and unused space on your hard disk. It can be made a copy of all information stored on a disk and restore either the entire disk or selected files. It is used to fin files that have not been used for a longtime. This utility also serves to increase the speed of a slow computer.