All I can offer is this information provided by Office MVP Beth Melton:

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. Another common add-in, the "Microsoft Works Suite Add-in for
Word" can only be found in your Add/Remove programs list.

Aside from the Works Suite Add-in, to determine if you have any add-ins you
can check for them using the following:

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.

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

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.

- 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

Hi Richard,

Don't you just love it when both parties point fingers at the other?? In
fact, it's likely that neither of them is directly at fault.

The description of Error 429 is "ActiveX component can't create object".
(It's always a good idea to quote the error dialog in your post, so we don't
have to waste time looking it up.) Google lists nearly 1000 mentions of that
error. It can have a number of causes, such as a missing file or
interference from other programs, but most often it means that the program
(in this case APA Perrla) is trying to use a DLL that isn't registered on
your computer -- that is, there should be a registry entry that tells
Windows where to find the DLL, but the entry is missing or garbled. In turn,
the usual reason for this is a mangled installation.

Try uninstalling APA Perrla and reinstalling it. Before you start the
reinstall, disable any antivirus program you have, because they often
interfere with installers.

If the error is still there, uninstall both Perrla and Office and then
reinstall them (Office first, obviously). BTW, this is one of the few
situations in which I would recommend an uninstall/reinstall cycle for
Office -- most other errors are caused by damage to templates such as
Normal.dot, which a reinstall won't fix, but this one runs deeper. Before
starting the uninstall, see
http://word.mvps.org/FAQs/General/FilesToBackup.htm to preserve your
customizations.