Hi, I am trying to convert a large PDF to a powerpoint

I am trying to convert a large PDF to a powerpoint document using a trial version of Acrobat XI Pro and I am getting the error message "Save as failed to process this document".

Any thoughts on something I can do differently or am doing wrong? I already followed these steps:

How to convert a PDF to PowerPoint:

1. Open a file in Acrobat XI.
2. Choose Tools > Content Editing > Export File to Microsoft PowerPoint Presentation.
3. Name the PowerPoint file and save it in a desired location.