The exact same thing happened to me.  I no longer have any restore points previous 
to April 8.  The update also set off a antivirus scan (McAfee).  I got the black 
screen after reboot for a very long time. More than a half hour.  I finally did a 
hard  shutdown, started up again, got a message saying it was updating stage 3 and 
to not turn off the computer.  Everything finished OK.  

My computer doesn't show SP1.  I have had Vista for a year and have done all the 
critical updates and many of the important updates.  This is the first time there 
has been a glitch.  Was it caused by my impatience? Or did my computer get stuck? 
It was very quiet before I did the hard shutdown.

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