 Windows NT was originally designed to be used on high-end systems and servers, however with the release of Windows 2000, many consumer-oriented features from Windows 95 and Windows 98 were included, such as the Windows Desktop Update, Internet Explorer 5, USB support and Windows Media Player.These consumer-oriented features were continued and further extended in Windows XP, which introduced a new theme called Luna, a more user-friendly interface, updated versions of Windows Media Player and Internet Explorer, and extended features from Windows Me, such as the Help and Support Center and System Restore.Windows Vista focused on securing the Windows operating system against computer viruses and other malicious software by introducing features such as User Account Control.