Help, the PowerPoint file is damaged

[clattering]

I got an error message that the PowerPoint file is corrupted, but it still can be opened (error Message attached). I tried to re-save the file, but even then I couldn't change anything because the program shows the message "not responding". Any ideas as to what is causing this? and how can this be corrected?

MSG error: PowerPoint cannot display part of the text, images, or objects as slides in a file.