A utility like PView, or Process Explorer might trace the event for you.
Process Explorer for Windows v10.21:
http://www.microsoft.com/technet/sys...sExplorer.mspx
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Mark L. Ferguson
..
"Maurizio" <Maurizio@discussions.microsoft.com> wrote in message
news:3D0E4245-CCD6-48F9-AFF2-936CE292A7B5@microsoft.com...
> I assist a friend with his genuine Windows XP Home Edition computer,
> assuring
> all the updates are done and the Antivrus and Antyspyware programs are
> regularly run; I was unable to help him on this: from some time a very
> quick
> message (with sound) appears low on the screen at irregular intervals. It
> is
> impossible to read the message because of the short permanency. I checked
> the
> Events logs and the message is not related to any system logged event.
> Changing the System Notification sound I made sure it is a System
> Notification message but I was unable to understand from which
> application/service it comes from. I tried to stop many programs from the
> Task manager, without success. Any idea helpful to identify the source
> please?