Unless you really can’t, just get whoever wants to see the powerpoint presentation to download the powerpoint viewer. go to microsoft.com and type powerpoint viewer in the search box at the upper right. (The download is 1.86 MB, barely 7 minutes on dial-up)
If you still want to convert it to a movie file anyway,
“Sometimes the simplest way to capture all the animations and sounds in a presentation is to make a movie of it, then distribute the movie rather than the PowerPoint presentation itself.
Programs like Camtasia and Hypercam can capture screen activity and save it to one or more movie formats.
Camtasia from TechSmith is a flexible screen recorder and video production tool that can record anything on the Windows desktop and produce AVI, Flash and other file formats. A fully functional evaluation version of Camtasia is available here. Camtasia Studio allows you to edit, annotate and add sound effects to your recorded files. PowerPoint MVP TAJ Simmons' PowerPoint to Video Tutorial describes the fine points of capturing movies from PowerPoint presentations using Camtasia.
There’s a tutorial at InDezine.
And from Jim Gordon, Mac Office MVP:
“The Mac utility I think works best is SnapZPro”"
A few pointers if you’re going to use hypercam or camtasia:
- This will take quite a bit of processing power, to both play the presentation and record it to an avi at the same time. A weak CPU will likely drop frames or play audio out of sync. You will also need generous amounts of memory.
- (This is if you’re using camtasia) Once you’re done recording the avi you may want to convert it to a different codec, since the techsmith codec isn’t very widespread in use.
A tutorial is here