Run the 707 installer again and select the "Repair" option when given the choice to "Repair" or "Remove". Then try it again.

Not quite sure of what your problem is. Are you saying that the 707 is not listed, or the plane itself can't be seen? I need a better description of what is happening. :(

Note. It might be the activation didn't work properly. If that is the problem, then you need to do a full uninstall and remove the registry entry, as described in KB #685, to sort it out.

Mark