It does not make any difference. I stopped a running program, went to file, then exit. Window would close, but LaView would remain in taskbar and would not go away. Would have to open task manager, stop labview, then would receive message, "program not responding", then would answer question box "end program?" with yes, and "labview" would disappear from tasbar indicating that it had indeed finally shut down. I have talked with one other person who is using labview with Windows xp pro sp2 rc1 and they said labview did the same thing on their computer.
I did a system restore and am back to windows xp pro sp1. LabView shuts down normally.