Firstly, turn of Fast Saves.
Click Tools > Options. Click on Save tab.
Uncheck Allow Fast Saves.
Now click File > Save As.
Save it under a new name.
Next, follow this article:
"Why are my PowerPoint files so big? What can I do about it?"
http://www.rdpslides.com/pptfaq/FAQ00062.htm
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Shawn Toh (tohlz)
Microsoft Most Valuable Professional (MVP PowerPoint)
Site Updated: May 21, 2006
Added PowerPoint Movies.
http://pptheaven.mvps.org
PowerPoint Heaven - The Power to Animate