As I look over https://www.google.com/search?hl=en&as_q=Error+Message+1635+powerpoint it is clear to me there is more than one cause. My advice is to forget the PC cleaner as that is not going to help at all.

Look at what others have done and consider a full uninstall and reinstall of PowerPoint if not Office.

BUT BEFORE ALL THIS!!! Try this. Create a new user on the PC and make it an admin account. Log into the new account and try again.
Bob