Windows XP

Windows XP is a line of operating systems developed by Microsoft for use on general-purpose computer systems, including home and business desktops, notebook computers, and media centers. The name "XP" stands for eXPerience. It was codenamed "Whistler", after Whistler, British Columbia, as many Microsoft employees skied at the Whistler-Blackcomb ski resort during its development. Windows XP is the successor to both Windows 2000 Professional and Windows Me, and is the first consumer-oriented operating system produced by Microsoft to be built on the Windows NT kernel (version 5.1) and architecture. Windows XP was first released on October 25, 2001, and over 400 million copies were in use in January 2006, according to an estimate in that month by an IDC analyst. It is succeeded by Windows Vista, which was released to volume license customers on November 8, 2006, and worldwide to the general public on January 30, 2007.The most common editions of the operating system are Windows XP Home Edition, which is targeted at home users, and Windows XP Professional, which has additional features such as support for Windows Server domains and two physical processors, and is targeted at power users and business clients. Windows XP Media Center Edition has additional multimedia features enhancing the ability to record and watch TV shows, view DVD movies, and listen to music. Windows XP Tablet PC Edition is designed to run the ink-aware Tablet PC platform. Two separate 64-bit versions of Windows XP were also released, Windows XP 64-bit Edition for IA-64 (Itanium) processors and Windows XP Professional x64 Edition for x86-64.Windows XP is known for its improved stability and efficiency over the 9x versions of Microsoft Windows. It presents a significantly redesigned graphical user interface, a change Microsoft promoted as more user-friendly than previous versions of Windows. New software management capabilities were introduced to avoid the "DLL hell" that plagued older consumer-oriented 9x versions of Windows. It is also the first version of Windows to use product activation to combat software piracy, a restriction that did not sit well with some users and privacy advocates. Windows XP has also been criticized by some users for security vulnerabilities, tight integration of applications such as Internet Explorer 6 and Windows Media Player, and for aspects of its default user interface. Later versions with Service Pack 2, and Internet Explorer 7 addressed some of these concerns.

Editions

The two major editions are Windows XP Home Edition, designed for home users, and Windows XP Professional, designed for business and power-users. Other builds of Windows XP include those built for specialized hardware and limited-feature versions sold in Europe and select developing economies.

Windows XP for specialized hardware

Microsoft has also customized Windows XP to suit different markets. Six different versions of Windows XP for specific hardware were designed, two of them specifically for 64-bit processors.

System requirements

System requirements for Windows XP Home and Professional editions as follows:

Minimum Recommended
Processor 233 MHz 300 MHz or higher
Memory 64 MB RAM (may limit performance and some features) 128 MB RAM or higher
Video adapter and monitor Super VGA (800 x 600) Super VGA (800 x 600) or higher resolution
Hard drive disk free space 1.5 GB 1.5 GB or higher
Drives CD-ROM CD-ROM or better
Devices Keyboard and mouse Keyboard and mouse
Others Sound card, speakers, and headphones Sound card, speakers, and headphones
In addition to the Windows XP system requirements, Service Pack 2 requires an additional 1.8 GB of free hard disk space during installation.

Service packs

Microsoft occasionally releases service packs for its Windows operating systems to fix problems and add features. Each service pack is a superset of all previous service packs and patches so that only the latest service pack needs to be installed, and also includes new revisions. Older patches need not be removed before application of the most recent one.

Service Pack 1

Service Pack 1 (SP1) for Windows XP was released on September 9, 2002. It contains post-RTM security fixes and hot-fixes, compatibility updates, optional .NET Framework support, enabling technologies for new devices such as Tablet PCs, and a new Windows Messenger 4.7 version. The most notable new features were USB 2.0 support, and a Set Program Access and Defaults utility that aimed at hiding various middleware products. Users can control the default application for activities such as web browsing and instant messaging, as well as hide access to some of Microsoft's bundled programs. This utility was first brought into the older Windows 2000 operating system with its Service Pack 3. The Microsoft Java Virtual Machine, which was not in the RTM version, appeared in this service pack.
On February 3, 2003, Microsoft released Service Pack 1 (SP1) again as Service Pack 1a (SP1a). This release removed Microsoft's Java virtual machine as a result of a lawsuit with Sun Microsystems.

Service Pack 2

Windows Security Center was added in Service Pack 2.
Service Pack 2 (SP2) (codenamed "Springboard") was released on August 6, 2004 after several delays, with a special emphasis on security. Unlike the previous service packs, SP2 adds new functionality to Windows XP, including an enhanced firewall, improved Wi-Fi support, such as WPA encryption compatibility, with a wizard utility, a pop-up ad blocker for Internet Explorer 6, and Bluetooth support. Security enhancements include a major revision to the included firewall which was renamed to Windows Firewall and is enabled by default, advanced memory protection that takes advantage of the NX bit that is incorporated into newer processors to stop some forms of buffer overflow attacks, and removal of raw socket support (which supposedly limits the damage done by zombie machines). Additionally, security-related improvements were made to e-mail and web browsing. Windows XP Service Pack 2 includes the Windows Security Center, which provides a general overview of security on the system, including the state of anti-virus software, Windows Update, and the new Windows Firewall. Third-party anti-virus and firewall applications can interface with the new Security Center.
On August 10, 2007, Microsoft announced a minor update to Service Pack 2, called Service Pack 2c (SP2c). The update fixes the issue of the lowering number of available product keys for Windows XP. This update will be only available to system builders from their distributors in Windows XP Professional and Windows XP Professional N operating systems. SP2c was released in September 2007.

Service Pack 3

Windows XP Service Pack 3 (SP3) is currently in development. As of January 2008, Microsoft's web site indicates a "preliminary" release date to be in the first half of 2008. A feature set overview has been posted by Microsoft and details new features available separately as standalone updates to Windows XP, as well as features backported from Windows Vista, such as black hole router detection, Network Access Protection and Windows Imaging Component.
Microsoft has begun a beta test of SP3. According to a file released with the official beta, and relayed onto the internet, there are a total of 1,073 fixes in SP3.
This update to Windows allows it to be installed without a product key, and be run until the end of the 30-day activation period without a product key.
On December 4, 2007, Microsoft released build 3264 of a release candidate of SP3 to both TechNet and MSDN Subscribers. On December 18, 2007, this version was made publicly available via Microsoft Download Center. The latest release of SP3 is Release Candidate 2, which was released to the private beta-testing group through its connect website on February 6, 2008, with a build number of 3300. On 19 February 2008 build number 3311 of SP3 Release Candidate 2 was released for public beta testing. In order to be able to download and install SP3 Release Candidate 2 via Windows Update or Microsoft Update, a script must be installed and any earlier version of SP3 must first be removed. SP3 Release Candidate 2 can also be downloaded by way of the Microsoft Download Center.