Install this update to resolve HTTP authentication issues in Windows-based systems that do not appear until Microsoft Internet Explorer 7 is installed. After you install this item, you may have to restart your computer. Update for Windows XP (KB904942) Update for Windows Server 2003 (KB904942) Update for Windows XP x64 Edition (KB904942) Update for Windows Server x64 Edition (KB904942) Update for Windows Server 2003 for Itanium-based systems (KB904942)