To fix this problme, you shall have to re-register the
Acrobat 8's PDFOfficeAddin.dll. Here are the stesp from one of the
kb articles on Adobe.com
Solution: Manually register the COM add-in file.
Disclaimer: This procedure involves editing the Windows
registry. Adobe doesn't provide support for editing the registry,
which contains critical system and application information. Make
sure to back up the registry before editing it. For more
information about the registry, see the Windows documentation or
contact Microsoft.
1. Close all Office 2007 applications.
2. In Windows Explorer, locate PDFMOfficeAddin.dll and note
its exact path, which may include spaces. Its default path is
C:\Program Files\Adobe\Acrobat
9.0\PDFMaker\Office\PDFMOfficeAddin.dll.
3. Do one of the following:
o On Windows XP: Choose Start > All Programs >
Accessories > Command Prompt.
o On Windows Vista: Choose Start > All Programs >
Accessories. Right-click on Command Prompt, choose Run As
Administrator, and authenticate.
4. In the Command Prompt window, type regsvr32 followed by a
space and the path that you noted in Step 1. Enclose the path in
quotation marks. For example, if PDFMOfficeAddin.dll is in its
default location, then you would type the following command:
regsvr32 "C:\Program Files\Adobe\Acrobat
9.0\PDFMaker\Office\PDFMOfficeAddin.dll"
5. Press Enter.
6. A dialog box will confirm that the registration was
successful. Click OK to close this dialog box.
7. Close the Command Prompt window.