Safe boot solves PowerPoint problem; how do I fix problem at source?

Question

I was trying to display a slide show in MS Powerpoint 2011 on my MacBook Air, but PowerPoint crashed every time I tried to launch the slide show. I found a Microsoft support article, https://support.microsoft.com/en-us/kb/975723?linkId=11072873, that suggested booting my computer in Safe mode and seeing if PowerPoint worked then. In fact, it does!
My question is, what has Safe boot revealed about why PowerPoint crashes when I try to display a slide show? Is there a way to fix the problem that causes PowerPoint to crash so that I don't have to boot into Safe Mode every time I want to do a PowerPoint slide show?

Answer 1

Put the disk in the computer and restart while holding the C key down. You pretend you want to reinstall the OS and go through the first two steps, until the screen just after the language selectiion screen.
On this screen you will see a menu bar. Click Utilities in the menu bar, and select Disk Utility. When DU is up and running, do this:
In the list at the left, select your start up disk- the item you want to repair. (Be sure to select an item that’s indented to the right in the list, not an item at the far left.)
Click First Aid.
If Disk Utility tells you the disk is about to fail, back it up and replace it. You can’t repair it.
Click Repair Disk.
When the repair is completed, quit DU and restart the computer.