Is there a way to convert a PowerPoint-generated PDF back into the original PowerPoint presentation, or something like it - a completely editable presentation?

Hi Priya
Try researching this link:
http://www.imtoo.com/pdf-to-powerpoint-converter.html
However with these third party products there are never any gurantees of quality.
Hope this helps.
Good luck.
Tony(OTPM)

Photoshop will batch--render a pdf into multiple jpgs which can then be imported into PPT.