Cannot launch imbedded PDF in MS Word document

I don't know why I'm writing this since the same questions has gone unanswered many times. As useful as Adobe Acrobat is, it leaves its customers and the public out to hang dry if a problem comes up. My imbedded PDF files in a MS Word document will not open because: ""The program used to create this object is AcroExch. That program is either not installed in your computer or is not responding. To edit this object, install AcroExch or ensure that any dialog boxes in AcroExch are closed!" What is the solution to this problem please.