We have tried completely removing Adobe Acrobat using the removal / cleanup tool but we're still getting the same problem. I have followed advise from I have been getting the "acrobat fail to send a DDE command" , and problem still persists. The only thing I did not do was change was the Log On properties of the Remote Procedure Call service. I would like to avoid making a major change such as this, but if there is good evidence this is the fix I will revisit this as an option.