If you download a template from microsoft it will automatically end up in the
right place.
From elsewhere the easiest method is to find & open the file just like a
normal presentation and then "save as" choose save as type "design template
*.pot" in the drop down menu (scroll down) .
It will save by default in the correct folder which is
documents & settings\your name\application data\microsoft\templates.
You may have to close and restart ppt before it appears in the design pane.
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John Wilson
Microsoft Certified Office Specialist
http://www.technologytrish.co.uk/ppttipshome.html