I had the same problem with Office Professional 2003 : When trying to reply
to an email, there is this window opening : "starting microsoft office word
as your e-mail editor" (i did NOT enable Word to edit my email).
- I tried to repair my Office installation
- I closed all MS Office programs and killed the remaining WINWORD.EXE
processes.
- then I restarted Outlook
- When I click on "reply" to a mail, this time it works but then I can't
close the message window, and I get the window "Word : this program is not
responding"... So it's still about Word...