PowerPoint Slide Show Converter turns a presentation created with Microsoft PowerPoint into a self-running slide show application (executable file) or a screen saver that can be copied to any computer and will run on Windows 95, 98, Me, NT 4.0, 2000, XP and 2003 without requiring any additional program files. If you want to send someone your PowerPoint presentation, distribute it via the internet or through data CDs, the best way to ensure that everyoe can view your presentation (not only those who has the needed version of PowerPoint installed on their computers) is to convert to to a self-running slide show using PowerPoint Slide Show Converter. The conversion is a one-way process, the source .ppt file cannot be restored from the converted .exe file, so PowerPoint Slide Show Converter is also useful to protect PowerPoint presentations from unauthorized editing.
Operating System Requirements:
This product is designed to run on the following operating systems:
I haven't tried this, but I'm certainly willing to assume it works as advertised. But for many users, the best way to distribute Powerpoint presentations to people who don't have Powerpoint won't cost US$49... at least not when Microsoft distributes a free Powerpoint viewer:
Existing users, 
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or when recent versions of Powerpoint can export packages that can be viewed without Powerpoint installed.