ieframe.dll failed to register

I have an Outlook add-in written in VS2005 (VSTO 2005, not SE) targeted at Outlook 2003. 

The add-in contained a reference to the Web Browser Control because the add-in allows the user to click a link that will open up a browser window to a page in an intranet ASP.Net application that is related to the Outlook email or contact record.

However, when IE7 got pushed to my development machine, the reference to the Web Browser Control got changed to include the new ieframe.dll in the setup project.

However, when I run the setup.exe on another machine, I get the error:

Module c:\program files\my add-in\ieframe.dll failed to register.  HRESULT -2147467263. 

Has anyone run into this before?  What's the proper way for dealing with this?

I also was adding a permission set for the

Interop.SHDocVw.dll