|You log off Windows via the start button.|
If you press Ctrl+Alt+Del keys together you could see if there are two appearances of msimn.exe (outlook express program file) in Task Manger. If so "End task" on one of them.
What is more to the point is whether the same thing happens if you restart the computer? That might be all you need to do.
Always pop back and let us know the outcome - thanks