Norton Safety Minder disabled, how to re-enable?

I keep getting notifications that NSM is disabled on the computer of my kids. The notification say I should go to the computer and restart NSM. However, there is no obvious way described how to do this other than restarting the computer.

Any short-cut? As far as I have understood, none of the kids should have tampered with the software or tried to disable it.

 

Best regards,

Ralf