Types and Usage of Utility Programs

1. File Compression- A program that shrinks the size of files so they require less storage space and reduce transmission time if sent over internet.
Examples:
i)PeaZip (opensource)
ii)WinZip

iii)WinRar

2.File Management- Is a program that performs functions related to files such as delete,copy,rename,move, view and disk management such as format & copies disk.
Examples:
i)Windows Explorer
ii)Free Commander (freeware)
iii)SE-Explorer (freeware)

3.Diagnostic Utility- 
i)Compiles technical information about a computer's hardware and certain system software.
ii)Prepares a report outlining any identified problems.
Examples:
i)PC Diagnostic
ii)Advance System Care
iii)CCleaner

4. Antivirus- That protects a computer against viruses by identifying and removing any computer viruses found in a memory,storage,media or incoming files.
Examples:
i)Norton Antivirus
ii)Kaspersky 2011 (proprietary)
iii)Avira 7.1

5. Defragmenter- Program that reorganises files and unused space on a computer hard disk.
Examples:
i)Disk Defragmenter (built-in-Utility)
ii)MyDefrag (freeware)
iii)Defraggler (freeware)

6.Disk Scanner- That checks the hard drive of your computer for errors and bad sectors.
Examples:
i)ScanDisk (built in windows utility)
ii)Scanner (open source)
iii)HDDScan (freeware)