Hm, go to the Task manager and check if you have any processes running for Netcam Studio. If you have processes End them and try again. Something is missing or something is blocking. If this dont work do a clean installation of NCS 156. First Uninstall. Then delete whats in ProgramData>Moonware folder and Delete ProgramFiles>Netcam Studio. Install NCS again.
I will setup a Windows 7 here and see if I can reproduce this.
I can run ncs 156 on win 7 with no problems.
The message in the picture above you usually get when the ncs server is running. So check the task manager.