Imaging for Windows on Windows 2000 is part of Windows setup.
Imaging for Windows is not in Microsoft Windows XP, if you need this you need to purchase it. It isn't legal to install Imaging from a previous version of Windows.
In the UK and Europe Imaging for Windows is available from
http://www.alliancegroup.co.uk/imaging-for-windows.html
You can now buy Imaging for Windows which is compatible with the earlier versions and also includes Optical Character Recognition (OCR) ande is suitable for use with Windows XP
Imaging for Windows is the Imaging application and ActiveX tools included in previous versions of Windows (see under Accessories/Imaging for Windows).