Symantec Framework Stopped by windows

I have been using the norton family safety for a while.  TOnight i noticed that the service was not running and had a message from windows (Vista Home Premium SP1),  that the service had been stopped.

 

I tried restarting the service and windows stopped it again.  A machine restart did not cure the problem.  I have uninstalled and reinstalled the program and it is now running.

 

Any ideas as to what may have gone wrong?