The new version of Internet Explorer, version 7, that is available for Windows XP SP2 (Service Pack 2) and Windows Server 2003 SP1 (Service Pack 1), includes improvements to reliability, compatibility, features, and security.
For a list of features, see http://www.microsoft.com/windows/ie/ie7/about/features/default.mspx
To download Internet Explorer 7, visit http://www.microsoft.com/windows/ie/downloads/default.mspx
NOTE: If you are running a beta version of Internet Explorer 7, you can install Internet Explorer 7 from Automatic Updates, from the Windows Update Web site, or from the Microsoft Update Web site.
To see the minimum system required, visit http://www.microsoft.com/windows/ie/ie7/about/sysreqs/default.mspx