Hi,
NCS version 1.6.1 is very old and not supported any more. I also don´t know which Windows OS it is running on. I recommend the following 2 alternatives.
0.first update Windows.
1.you can download the latest version 1.9.5 and just do an upgrade. Make sure that the prerequisites are fulfilled. I am not sure if this will work since it is very old.
2.do a clean installation How to make a clean installation of Netcam Studio. I recommend to use a program like Revo Uninstaller (free version) or similar to completely remove all of the old version. Make sure you have the license number before starting this. Install the latest version of NCS and configure it again.
Still problems, contact support at support@netcamstudio.com
-Henrik