One other location, the articles didn't mention was
C:\Program Files\Microsoft Office\Office12\STARTUP
(usually the above location, if not, look for the Office 12\Startup folder
on yr system)
This location can also host *.dotm or *.dot files (addins)

If there are files present, exit Word 2007 and if Word is the emaileditor to
Outlook then exit Outlook 2007 as well.
Move the files to another directory and run yr project.
In order to isolate the bugging addin or dotm file, you can reinstate each
file -that you moved away previously- to it's original location and
run yr project again.

--
Krgrds,
Perry

System:
Vista/Office Ultimate
VS2005/VSTO2005 SE