I'm not sure exactly what's new in this update to the Windows Scipt Engine, but 5.7 is the version of the engine in Vista. Anyway you can now download this version for XP, 2003 and 2000.
- Windows Script 5.7 for Windows Server 2003
Windows Script 5.7 for Windows XP
Windows Script 5.7 for Windows 2000
This download installs Microsoft® Windows® Script containing Visual Basic® Script Edition (VBScript.) Version 5.7, JScript® Version 5.7, Windows Script Components, Windows Script Host 5.7, and Windows Script Runtime Version 5.7.
Source : Bink.nu
