try authorpoint lite, see included link

http://www.authorgen.com/authorpoint-lite-free/download-freeware-ppt-to-flash-powerpoint-converter.aspx

Here is the short deion,

Deion: AuthorPOINT Lite is a freeware program that can convert Powerpoint presentations into flash. It offers a number of interesting features such as the ability to define quality output settings, a handful of output templates to choose from, and the option to upload your presentations for online viewing using a platform which the developers call “authorSTREAM”.