Hello Dave,
Do you have an error code for the failure?
What is in windowsupdate.log?
Thanks,
Darrell Gorter[MSFT]

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|>From: "Dave Horne" <dave.horne@home.nl>
|>Subject: Update KB925902 failed
|>Date: Wed, 4 Apr 2007 00:08:30 +0200
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|>This security update (for Vista) KB925902 failed upon reboot. I have
|>attempted to install this update three times.
|>
|>Am I alone? Suggestions?
|>
|>Thanks, Dave Horne (Vista Home Premium, 32 bit)
|>
|>