A computer is an important tool in an office because it is used for preparing documents, maintaining records, communicating with others, storing data, and accessing the internet. If an office computer becomes slow and frequently displays warning messages about malware, it may indicate that unnecessary files, unwanted programs, system errors, or malicious software are affecting the computer. Utility software and antivirus software can be used together to improve system performance, maintain the computer, protect important data, and reduce security risks. Utility software is a type of system software designed to maintain, manage, protect, and optimize a computer system. It performs various tasks that help the operating system and other software work efficiently. Common examples include disk cleanup utilities, disk management tools, backup utilities, file compression programs, system monitoring tools, and security utilities. When an office computer becomes slow, utility software can help identify and remove some of the causes of poor performance. One useful utility is the disk cleanup tool. During normal computer use, temporary files, cached internet files, old installation files, recycle-bin contents, and other unnecessary files are created. If these files accumulate, they can consume a large amount of storage space. A disk cleanup utility scans the storage drive and identifies files that are no longer required. Removing unnecessary files frees storage space and can make the system easier to manage. However, users should review important files before deleting anything permanently. Disk optimization and drive management utilities can also help maintain storage devices. On traditional hard disk drives, fragmentation can cause files to be stored in different locations, making the drive work harder when accessing them. A disk defragmentation utility can organize fragmented files more efficiently. Modern operating systems normally manage this process automatically. Solid-state drives should not be treated like traditional hard drives; they generally use an optimization process such as TRIM instead of conventional defragmentation. Therefore, the appropriate utility should be used according to the type of storage device. Another important utility is a system monitoring tool. It can show information about processor usage, memory consumption, disk activity, and running applications. If a particular program is consuming an unusually large amount of CPU or memory, the user can investigate it and close the program if it is unnecessary. System monitoring can also help identify programs that automatically start when the computer is switched on. Disabling unnecessary startup applications can reduce startup time and leave more system resources available for office work. File and application management utilities are also useful. Removing unused applications can free storage space and reduce the number of background processes running on the computer. Temporary or unwanted browser extensions