Windows Xp is a line of operating systems and widely used which is produced by Microsoft for use on personal computers running x86 and IA-64 processors, including home and business desktops, notebook computers, and media centers. Windows XP was first released on 25 October 2001, and over 400 million copies were in use in January 2006. Windows XP uses the NT conventions of protected memory, which is a way of preventing system crashes by running programs in their own separate RAM locations. Processor 233 MHz1 300 MHz or higher .Memory 64 MB RAM2 128 MB RAM or higher. Video adapter and monitor Super VGA (800 x 600) or higher resolution. Hard drive disk free space 1.5 GB or higher (additional 1.8 GB in SP2 [32] and additional 900 MB in SP3 [33]) .Drives CD-ROM drive or DVD drive. Input devices Keyboard. Microsoft Mouse or compatible pointing device Sound. The old FAT (File Allocation Table) file system was developed originally (when the original IBM PCs came out) for MS-DOS on small machines and floppy disks. Later, a more advanced file system was developed for hard disks in Windows NT, called NTFS (the “NT File System”). As low as CAD$175.13

 

MS Windows Vista:

 

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, audio, print, and display sub-systems. Vista also aims to increase the level of communication between machines on a home network, using peer-to-peer technology to simplify sharing files and digital media between computers and devices. Windows Vista includes version 3.0 of the .NET Framework, which aims to make it significantly easier for software developers to write applications than with the traditional Windows API.

Ubuntu Linux (latest version)

Ubuntu is a community developed linux-based operating system that is perfect for laptops, desktops and servers. It contains all the applications you need – a web browser, presentation, document and spreadsheet software, instant messaging and much more. Its latest version in January 2009 is ubuntu 8.10.
Ubuntu 8.10 Desktop Edition delivers the features you need for an increasingly mobile digital life, including 3G wireless support and guest sessions that lets users temporarily share computers without compromising security. Ubuntu 8.10 Server Edition consolidates its support for virtualization with an integrated Virtual Machine builder, and brings with it a fully-supported Java stack and support for per-user directory encryption. Supports 32 bit or 64-bit, Supports 4GB of RAM, $20 Ubuntu 8.10 desktop edition

 

 

BeOS

Was an operating system for personal computers which began development by Be Inc. in 1991. It was first written to run on BeBox hardware. BeOS was optimized for digital media work and was written to take advantage of modern hardware facilities such as symmetric multiprocessing by utilizing modular I/O bandwidth, pervasive multithreading, preemptive multitasking and a custom 64-bit journaling file system known as BFS. The BeOS GUI was developed on the principles of clarity and a clean, uncluttered design. The API was written in C++ for ease of programming. It has POSIX compatibility and access to a command line interface through Bash, although internally it is not a Unix-derived operating system. 64-bit graphical user interface, and it costs $99.95.

 

MAC OS X (latest version)

pronounced /mæk oʊ ɛs tɛn/)^[3] is a line of computer operating systems developed, marketed, and sold by Apple Inc., and since 2002 has been included with all new Macintosh computer systems. Mac OS X is the successor to the original or “classic” Mac OS, which had been Apple’s primary operating system since 1984. Unlike its predecessors, Mac OS X is a Unix-based operating system,^[4] built on technologies developed at NeXT between the second half of the 1980s and Apple’s purchase of the company in early 1996. Version 10.5, while running on Intel processors, is certified UNIX 03.