If the problem occurred only one week ago, you should be able to correct it
by using System Restore to a date and time prior to the start of the problem.
> About a week ago, a very irritating behaviour started on my Vista
> Ultimate machine at home:
> If left alone for approx 5 - 10 minutes, the machine makes a 'pinging'
> sound and displays the "Welcome" screen with a little icon displaying
> my Vista username.
> In order to continue with what I was doing, I have to click the little
> icon, listen to a pinging sound and wait for a few seconds while the
> machine removes the welcome screen and displays the desktop as I left
> I do NOT want this behaviour and I have searched in vain for how to
> turn it off... Since I did not consciously turn it ON, I have no idea
> where to look!
> I DO want to screen blacked out after a couple of hours inactivity -
> but this pointless "logout" is only infuriating.
> Does anyone know where I can find the settings for this?