Recently, Microsoft made a public release of Windows Script v5.7 which ships with different flavors of Windows® Vista for for Windows® 2000/XP as well as Windows® 2003 Server.
Below are the download links for the same
Download Windows Script 5.7 for Windows XP
Download Windows Script 5.7 for Windows 2003 Server
Download Windows Script 5.7 for Windows 2000
IE and especially AJAX users should surely install this update. Don (who’s the test lead on the JScript team) has enumerated upon the reasons and advantages one would get by installing the update at our JScript team blog here - http://blogs.msdn.com/jscript/archive/2007/08/12/windows-script-5-7-released-for-windows-2000-windows-xp-and-windows-2003-server.aspx
Note: The release notes for the same are now available at http://download.microsoft.com/download/f/f/e/ffea3abf-b55f-4924-b5a5-bde0805ad67c/Windows Script Release Notes.rtf