New forum so I don't know how well the search works, but this has been discussed MANY times
General advice is to NOT have both Acrobat and Reader installed
I wish it was that easy, but not an option in my environment.
Having multiple Acrobat products on a single system has always been a problem becuase the order of installaiton deteremines which is the default PDF viewer and the user preferences within the application need to be set not to tested and not to reset the preference.
You can have the application you want to have link open in open prior to clicking the link.
You can change the file association used by Windows Explorer and then do not change that selection.
change 'HKEY_CLASSES_ROOT\AcroExch.Document.7\shell\Open\command' default value to point to the reader path instead of Acrobat.exe