I believe that you get that error because the process is already running as service.
The user interface should appear once the service is started. The problem is why you can't see the user interface when it is running.
Lookout 5.1 starts up as service on my xp computer without any problem. It's running just like I launch lookout.exe.
If you start the service manually, will lookout start up and user interface appear?
Ryan Shi
National Instruments