A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
A couple of things to consider:
If you saved as a PPT 97-2003 format file (.PPT) then some parts of your presentation may become uneditable pictures when you open the PPT in PowerPoint 2003 or earlier, but it should affect you if you continue opening the presentations in PPT 2007 or 2010.
I thought perhaps you might have set PPT to save as default to a Picture presentation, but that's not possible ... it's not one of the default save-as options.
I'd make sure when saving to choose File | Save As the first time and choose PowerPoint Presentation (*.pptx) as the Save As Type.
Then as you work on the presentation, whenever you've done more work than you're willing to risk, save as to a new file name. Whatever-001.PPTX then Whatever-002 and so on.