You can convert your presentation into pdf. Check this out:
"How can I make Acrobat PDFs from PowerPoint?" http://www.rdpslides.com/pptfaq/FAQ00517.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
Not Free but not expensive and a very good answer to your situation is
the Secure Pack program. Seems like I'm pushing this a lot lately but
it is what you need to control your presentation. Password to open or
to edit or how many time it will run etc. http://skp.mvps.org/securepack/index.htm