Windows XP Pro w/SP2 . The Most Reliable Operating System! By building on the proven Windows® 2000 operating system, Windows® XP Professional delivers a reliable foundation you can count on to keep your computer up and running when you need it most. Not only is Windows® XP more reliable, it also helps you more easily recover from system problems. Windows® XP Professional delivers the new standard in reliability and performance. This operating system is designed for businesses of all sizes and for users who demand the most from their computing experience.** Benefits Designed for reliability, security and privacy, high performance, and ease of use, the Windows® XP operating system provides a host of benefits for business and home users. A clean and simple desktop, rock-solid reliability, and easy-to-use features that take advantage of the digital age all contribute to the value of Windows® XP.