Editing a power point file after it's been converted

What you're asking is impossible. You can't edit a PDF or any other file AFTER it's converted to other formats.

• Please revert to your ORIGINAL document and the native app that created it.
• Save changes. 
• Re-convert to Powerpoint.

[Moderator moved from Creative Cloud Services to Acrobat.]

That is a Microsoft program, Go to the Search bar at the top of http://www.microsoft.com/en-us/ to find help with Microsoft programs