Hi, Alle,
Do you have LabVIEW 7.0 or 7.1? Probably that is the case, and that is why you are not able to open this VI. New with LabVIEW 7.x, there is a VI that programatically allows you to reboot the controller. Just go to you Block Diagram and in the Functions Palette, go to the LabVIEW Real-Time palette. Find the Real-Time Utilities subpalette and in there you will find the "RT Reboot Controller.vi". That should do the trick for you.
GValdes
Applications Engineer
National Instruments