NecroVisioN: Lost Company

Ludicus 3. pro. 2012 v 10.05 dop.
Game not starting?
When I try to start the game, I get the cd-key prompt. When I launch the game, I get "Preparing to launch..." then it disappears and opens the cd-key window again. I checked the box so I don't see it again, now when I start to play it I get "Preparing to launch...", then it disappears and appears again, then I get a "Application already running" error. What might be the problem?