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Windows 98 SE, Windows Me, Windows NT 4.0, Windows 2000 Professional Edition and Windows XP Home Edition to upgrade to Windows XP Home Professional SP2 at a cost reduced when compared to buying the full version of the software.Windows XP Professional Edition is a full-featured operating system for x86-based PC computers. The OS features the familiar Windows GUI, popular software such as Internet Explorer, Outlook Express and Media Player, enhanced system security and driver support for many popular hardware peripherals. Windows XP is an excellent OS choice for virtually any professional PC user.