USER INTERFACE-the visual portion of the operating system software that determines the manner in whch users interact with the computer.
UTILITY PROGRAM-a program that assists the user in maintaining and improving the operating system. Some utility programs are supplied by the operating system while others are sold by third-party venders.
VIRUS-a program designed as a prank that replicates itself from one computer to another. Viruses can be harmless but annoying to users or they can affect software performance and destroy information.
WINDOWS-the common name of the family of operating systems with graphical user interfaces, manufactured by Microsoft Corp.
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