What is service pack 3?

The Windows 2000 "classic" interface can be used instead if preferred. Several third party utilities exist that provide hundreds of different visual styles. In addition, another Microsoft-created theme, called "Royale", was included with Windows XP Media Center Edition, and was also released for other versions of Windows XP, but has since been removed from the original Microsoft New Zealand package. The Luna theme uses 4 more megabytes of RAM than the "Classic" Windows theme, so Classic can possibly improve performance on lower-end systems.