Could not create an instance of the OLE control

Hello

Dynamics NAV 2009 R2 Classic on Windows7

I tried to install Shauravs smtp port code at http://saurav-nav.blogspot.fr/2013/12/before-nav-2013-smtp-setup-with-port-no.html
but it did not work : even if the controlk registered successfully, it diappeared in dynamics and so automation variable was not more declared

So I decided to try use of a smtp adresse where the default port 25 is applied so that I do not need Shauravs code.

But now when I try to install the previous dll & tlb (that I saved before proceeding) - here aussi the regasm command is successful and this time I can see come back the Microsoft Navision Mail control SmtpMessage
But when I execute code using CU400 then I get :
Could not create an instance of the ole control or Automation server identified by ...

Please if someone has an idea to get work again this mail function would be nice