The update is not installed successfully, you receive a message, and the
computer restarts when you try to install an update in Windows Vista
http://support.microsoft.com/kb/949358
When you try to install an update from Windows Update on a computer that is
running Windows Vista, you may receive the following message: configuring
updates stage 3 of 3. 0% complete
After you receive this message, the computer reverts to the screen that
displays the same message. Additionally, the update is not installed
successfully, and the computer restarts.
For those who are unfamiliar with System Restore in Vista - see Using System
Restore from the Vista Windows Recovery Environment
http://www.bleepingcomputer.com/tutorials/tutorial142.html
Important: Things to know before you download Windows Vista SP1
http://technet.microsoft.com/en-us/windowsvista/bb968859.aspx
Learn how to install Windows Vista Service Pack 1 (SP1)
http://windowshelp.microsoft.com/windows/en-us/Help/133c8953-c9cd-4fa5-8883-03e91bb6f2021033.mspx
Windows Vista Service Pack 1 (All Languages)
Unlimited installation and compatibility support is available at no charge
until March 18, 2009.
https://support.microsoft.com/oas/default.aspx?ln=en-us&x=8&y=7&prid=11274&gprid=500921
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TaurArian [MVP] 2005-2009
Update Services
http://taurarian.mvps.org
In otherwords, you boot from the DVD.