The add-in "at_ext1.dll" could not be installed or loaded.

[CJZ]

I have seen the above error message on a few machines and was wondering if
anyone else has seen it. So far my only solution has been to reinstall
Office. Detect and Repair hasn't worked.

Error seems to be profile specific.

Outlook 2003 on XP SP2

 

[Hal Hostetler [MVP P/I]]

It appears that .dll belongs to the Captaris Rightfax client plugin. See
the following:

http://www.eggheadcafe.com/forumarchives/outlookgeneral/Dec2005/post25418237.asp
I'm getting AT_ext1.dll error on my outlook

Hal
--
Hal Hostetler, CPBE -- (e-mail address removed)
Senior Engineer/MIS -- MS MVP-Print/Imaging -- WA7BGX
http://www.kvoa.com -- "When News breaks, we fix it!"
KVOA Television, Tucson, AZ. NBC Channel 4
Live at Hot Licks - www.badnewsbluesband.com

 

[CJZ]

I came across that reference via Google earlier. Unfortunately, we can't get
into Outlook to access the plugins... I also see no reference to the plugin
in my profile on the machine...

 

[Diane Poremsky {MVP}]

You can disable it in the registry.
HKEY_LOCAL_MACHINE\Software\Microsoft\Office\Outlook\Addins\ - change
loadbehavior to 2

it may also be under the same path in HKCU

 

[CJZ]

I found the following hotfix was the solution:
http://support.microsoft.com/kb/950282