Have you tried repairing MS Office? See Repair an Office application

Now I'm REALLY SCREWED!

I started a repair on Office. There was a download, then an install. Half way through the install, a popup appeared saying I was off line. I checked. I wasn't. Then the popup went away but the install NEVER continued. After waiting a long time, I closed the box, went back to apps and selected repair again. It spun for a second, then the green arrow check mark appears. But now all my Office apps are gone. I tried again, same thing.

Desperate, I tried the reset option. Same check mark. Same thing.

I am now downloading Office and will re-install. I'll let you know if this works.