Fast Solution to Problem: Microsoft Equation Editor 3.0 cannot be used in one particular document

Microsoft Equation Editor 3.0 cannot be used in one particular document

I have seen an earlier question related to this.  You click on Insert > Object > Microsoft Equation 3.0, and get the error message, Microsoft can't start the application required to open this object.
An error occurred and this feature is no longer functioning
properly.
Would you like to repair this feature now?" 
If I click Yes, then some process occurs, and I have to reboot for the changes to take effect.  However, the problem is not solved and the same error occurs if I try to insert and equation using Microsoft Equation 3.0. 

If I click No, then I get the following message:
"The program used to create this object is Equation.
That program is either not installed on your computer or is not responding.
Tio edit this object, install Equation or ensure that any dialog boxes in Equation are closed." 

There is an OK button to click to get rid of this message.
The problem is that this problem is unique to this file.  I can use Equation 3.0 in another document.
What is causing the problem, and how can I go about solving it?

Solutions to the Problem Microsoft Equation Editor 3.0 cannot be used in one particular document

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No, I can't think of any other suggestion.
The "convert" button is only displayed unless you have opened an older file format in compatibility mode.  "Dynamic" menus and ribbon are SOOOOO confusing!  (I hate them.
I much prefer when they simply disable functions and display them greyed.
out.)
I am pretty sure you will find the cause of the problem localized in one piece of the docuement.  As to the actual cause, I don't have any ideas about the cause until you find the problem.
You have suggested the best course, continue copy and pasting until you find the culprit.
I suspect the actual piece problem will be very small, not much problem to recreate.

To check for Windows updates

1. Open Windows Update by clicking the Start button Picture of the Start button, clicking All Programs, and then clicking Windows Update.
2. In the left pane, click Check for updates, and then wait while Windows looks for the latest updates for your computer.
3. If any updates are found, click Install updates. Administrator permission required If you are prompted for an administrator password or confirmation, type the password or provide confirmation.

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