Embedded pdf error when closing Acrobat

Created an OLE field in Access 2003 table. Most types of embedded 
do***ents open and close from there fine but Acrobat 8 give an error 
when closing the pdf viewer: 

"The operation on the Acrobat Do***ent object failed.  The OLE
server may not be registered.  To register the OLE server, reinstall 
it."

I've tried several machines and all fail in the same manner. There is a 
posting on this "OLE Server Issues and PDF's" dated June 19 2007 where 
it's stated that registering the Adobe Acrobat 8.0 Type Library fixes 
this issue but it does not for me.

Can anyone shed light on this?