WINDOWS:
Windows is a line of operating systems produced by Microsoft for use on personal computers, including home and business desktops, notebook computers, and media centers.
Windows Vista is a line of operating systems developed by Microsoft for use on personal computers, including home and business desktops, laptops, Tablet PCs, and media center PCs. Windows Vista contains many changes and new features, including an updated graphical user interface and visual style dubbed Windows Aero, improved searching features, new multimedia creation tools such as Windows DVD Maker, and redesigned networking,
UNIX:
Unix is a computer operating system originally developed in 1969 by a group of AT&T employees at Bell Labs, including Ken Thompson, Dennis Ritchie, Douglas McIlroy, and Joe Ossanna. Today's Unix systems are split into various branches, developed over time by AT&T as well as various commercial vendors and non-profit organizations.
The UNIX system has been around for a long time, and many people may remember it as it existed in the previous decades. Many IT professionals who encountered UNIX systems in the past found it uncompromising. While its power was impressive, its command-line interface required technical competence, its syntax was not intuitive, and its interface was unfriendly.
COST OF OPERATING SYSTEMS:
The costs of operating systems are difficult to predict since it changes rapidly if a new version of operating system is launched. The cost of UNIX operating system is difficult to predict because it is developed by many commercial vendors and cost of windows is changing time to time.
However the cost of latest windows operating systems is given below,
Microsoft windows vista ultimate( $207 to $259
Microsoft windows xp sp2( $97 to $239
The UNIX operating system is an open source and it has GNU license and hence its available free of cost or low cost. Now UNIX