Unable to cast COM object of type

Is the message I get when I try to launch DAISY styles in Word xp. It's missing the interop app. Exception is: HRESULT: 0x80004002 (E_NOINTERFACE) Is there a way to launch that interop app? Thanks, Olaf

Primary Interop Assemblies (PIA) is a pre-requisite for installing DAISY Translator on Office XP. In addition the Microsoft Office compatibility pack is also required. Google for PIA installer or look at this page http://www.microsoft.com/en-us/download/details.aspx?id=227

... I knew that.

Thank you, Prashant