Per philo:
I've had that happen too...and worse still...Windows insisted on wanting
to reboot and there was no way to set the schedule longer than four hours.

When it got close to reboot time, I reset the schedule for another 4
hours but that was of course ignored and the machine rebooted anyway.

I see no problem in having Windows remind the user from time to time
that a reboot is necessary...but to go ahead and just do it is inexcusable.

Mine finally came back sometime during the night - so I guess my little
theory about the screen saver mode was incorrect and the update just
took over the machine for 12+ hours...maybe close to 24.

Looking on the bright side, the install of Prey (computer
tracking/recovery utility) is now working whereas it was not before the
update..... and my System drive space is still a little over 3 gigs.
--
Pete Cresswell