I'm at a loss as to what it might be how it can report a PID that isn't in the task manager, unless because you are killing it, when you come to check the task manager it is no longer there. Try ignoring the alert once and then check if the PID number is in the Task Manager.
Or you could use a utility called Process Explorer (I haven't got a link yet), used to be sysinternals.com but it is now bought out by Microsoft, who continue its development.
Found the link,
http://technet.microsoft.com/en-us/sysinternals/default.aspx, look there for the utility.