Outlook close error...again...again

  m800afc 19:11 03 Apr 09
Locked

Sorry chaps and chapesses, but the outlook error is back.

click here
click here

I am at a loss to explain why. I have not knowingly changed any settings, or installed any new applications. At the same time, all my system restore points have gone, again. I have rerun, quite independantly of each other, the usual anti malware progs, and can find nothing.
The major problem that this causes is that I can no longer shut down the computer normally. When I shut down, the shutdown procedure is interrupted by this error message, and refuses to continue until I provide an approriate input. I then have to restart the shutdown procedure.
Any observations gratefully welcomed.

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