To be honest I'm not a big fan of phoning support as I end up talking to somebody I can't understand and put on hold for half the day only to be told sorry we can't help you - reinstall windows.
Anyway, I've had some success. I uninstalled the software, cleared the registry and rebooted. Then reinstalled 4.1.1 but install with compatibility mode (XP) and admin rights. Then I configured all 8 cameras one by one.
Now it is working without the runtime error. I can remote access from another pc!
Now, another config issue if you don't mind. For some reason I can only display one camera at a time in the live play software (3x3 grid view). I can see all 8 cameras in the tree list of my server. I can display another camera but if I first disconnect the displayed camera and select the next. Click on connect to all only displays 1 camera.
I'm sure this is a simple config issue I can work out.
Edit: I've just read the manual it appears that only 1 camera stream can be displayed at a time using the live stream software.