Use the control panel in whatever version of windows you have, and then select "Add/Remove programs". Remove CDC-X there.
Using the system uninstall will not delete your saved messages.
If you want to delete all your messages too, you can just delete the installation folder (usually My Documents\Dwyco\CDC-X, CDC-X makes no modifications to your system except in the installation folder.
Drag the green guy icon to the trash. To remove all your saved messages and other account information, use the finder to locate and remove "Library/Application Support/CDC-X".
Remove the "cdcx" folder created when you installed, usually $(HOME/cdcx. This will delete all your saved messages too.