Oh bless you, Marnix. That worked for me too. Finally. All the other solutions listed here were so appallingly cumbersome, I finally just refused the update and figured I'd get along without it. But yours actually sounded sensible and do-able, and yes, it worked. The system was looking for one file in the wrong place during the reinstall, but I searched, found it and re-directed the program. Went to Microsoft updates and re-allowed the update, it ran this morning with no indigestion.
I bow to you.
Munacil