We have one pc in the company with Land Desktop 3 installed. We have been using it for many years without any issues until recently (11 Oct 12) after installation of Norton Internet Security 2013, an authorization popout window (the one you see during the first installation) appears suddenly with the follow message:
IMPORTANT! In order to contnue, you must obtain additional authorization. Error 
I would appreciate if anyone could provide some advices to us.