You are working just fine but you go to use Adobe Acrobat Reader and get the following DDE Server error and need to fix it.
First open Acrobat, then goto the “Help” tab and choose the “Repair Adobe Reader Installation” option. You will see the prompt “Are you sure you want to repair the current installation”. You would click on “Yes” to repair. It will do a reinstall of Reader and then prompt you to restart your machine.
If the steps above don’t work out for you, simply manually uninstall Reader and download a fresh version and install that.