I am editing a powerpoint created by a colleague and whenever I try to change something such as a character or a scene, I got an error message and then when I went to save the file it says the file is corrupt and cannot open so I had to shut down and lost all the work. When I started a new presentation and went to add a character, it would load and let me see one character but none of the others and then eventually would not display the character selection photos to choose from. When I cancelled and tried again, the menu went to the side of the screen and all froze up - again had to shut down. Help, I have a really important presentation to do and it appears I cannot use this software.
Then when I open the presentation after shutting down, I get a message that it experienced a serious error with an add-in and if I have gotten this message several times to disable the add-in. Which add-in??