If you ever need to extract the slides from a PowerPoint slideshow, like you sometimes receive in emails, and you don't have PowerPoint, then you can download -- for free-- Open Office from Sun Microsystems. The package includes Impress, which is PowerPoint compatible. I installed the entire package, but I think you can install just Impress. The other applications are knockoffs of Microsoft Word, Excel, Access, etc.
http://download.openoffice.org/
You can export to .SWF and .PDF as well as .png, jpeg, and others formats.
I didn't realize that Adobe Reader has a srolling feature. I opened a .PDF file with stills and turned on the scrolling feature to view the slides. For the .SWF file, I had to open it from Internet Explorer, which initially blocks access to the Shockwave player. The presentation looked better than the original .PPS I got in email. Double-clicking on the .SWF on my desktop didn't work.
In Premiere Elements, the .SWF will play back in burst mode, so I had to use timestretch to lengthen the time.