If you have auto install the system reboots during install to complete
the install just like any other update, its not rocket science
If you dont want auto install/reboot turn it off, as Ive not had any
problems with Vista 64 appart from downloading the 64bit codec package I
see no reason to download any more updates so I turned it off.
Windows XP used to try to auto reboot but at least that gave the option
to restart later, but only if you were at the pc
http://www.iqcontent.com/blog/files/WindowsRestart.jpg
Obviouslt MS think everyone should update imediately and for the vast
majority of users who get viruses, malware and other exploits it
probably best to auto download the updates at least
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sosrandom