On line family norton

I have installed this program but continue to get this msg in the boys' profile...

 

Wait! Did you know that Stefan is not currently assigned to a computer? Click here to download and install the Norton Safety Minder on this computer.
To download and install on another computer, click here.

So I click on link but when I do so it wants to uninstall the program which is obviously already installed.  Why do I get this msg - I also get the msg toinstall the program when I log on to my computer???