A "runtime" error means that there is an error in a macro or add-in
that is attempting to run. Typically these macros are created by a
third-party and are not part of the Word installation. (They could
also be caused by a malfunctioning macro virus as well)

Many third-party applications will create an add-in and place it in
the Office\Startup folder or use a COM add-in (DLL) to integrate their
software with Word.

As of Word 2000, Word can have COM add-ins, those that are added in
via the Registry rather than the Startup folders. To check for COM
add-ins add the "COM Add-In" command to your toolbar.

Try this first since a C++ error indicates the problem is in a COM
add-in:

- Right-click any toolbar and select Customize
- On the Commands tab, select the Tools category
- Locate COM Add-Ins on the right
- Drag/Drop to a location of your choice

For more information on COM Add-Ins, see this article:
http://www.mvps.org/word/FAQs/Customization/CheckIfAddinsInstalled.htm

Go to Tools/Templates and Add-Ins and see if there are any global
templates or add-ins listed. If you find any then chances are they are
located in your Office\Startup folder or Word\Startup folder.

The location of the Word\Startup folder can be found under
Tools/Options/File Locations and the Office\Startup folder will be
located in the installation path for Office.(You can also use Windows
Search and search for the file names)

If you find more than one add-in move them one at a time until you
determine which one is causing the problem.

For additional troubleshooting steps for errors starting/exiting Word
see this article:
http://www.mvps.org/word/FAQs/AppErrors/ProbsOpeningWord.htm