I assume you are running Netcam Studio version 1.9.5.
This problem seems to be with the graphical interface and after a Windows update. Test the following:
Stop Netcam Studio.
-go to C:\Users%username%\AppData\Local\Moonware and delete all.
-go to C:\Users%username%\AppData\Local\Moonware_Studios and delete all.
-go to C:\Users%username%\AppData\Roaming\Moonware_Studios and delete all.
Start Netcam Studio again.
Is the problem still there it’s probably a damaged configuration file. A clean installation usually solves the problem. More info here How to make a clean installation of Netcam Studio