Error message : cannot open dde link to acrobat exe
Edit the file Arcobat OpenDoc.edt
line 106 : DDEOpen('%$("Acrobat")',"acroview","control",0);
if u use Acrobat "Reader" XI
modify line 106 to DDEOpen('%$("Acrobat")',"acroviewR11","control",0);
R means Acrobat Reader and number is the version of Acrobat Reader.
and if u use Acrobat "Pro" XI
please modify to DDEOpen('%$("Acrobat")',"acroviewA11","control",0);