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Windows Host Script can be downloaded from [http://www.microsoft.com/downloads/details.aspx?familyid=c717d943-7e4b-4622-86eb-95a22b832caa&languageid=f49e8428-7071-4979-8a67-3cffcb0c2524&displaylang=en this page] - although it should be in already exist on your system if you use Windows XP or Windows 2003.
If you have Windows 2000, the version of the Windows Host Script you have is too old and you should download it from the site above.