Vista Service Pack 2 installs 64-bit (KB948465) / Service pack has not been installed - Code 80070005 - Windows Update encountered an unknown error

I have never had a problem with my computer before updating. I looked at various sites in regard to this problem and have noticed that a lot of people's problems with this update. Windows Installer Clean Up tool has failed. I also tried to install this through my anti-virus and that didn't work either. It is a complete mystery. Any help would be appreciated.

Thank you

Thanks for posting on the Microsoft Answers community forums.  We want to help you solve your problem with the installation of service pack 2.  There are several things that could cause this problem.  Here's an article in the knowledge base that has some tips troubleshooting step by step for this specific problem:
How to troubleshoot the installation of the service pack, Windows Vista and Windows Server 2008 issues.

The article is too long for me to post this here, so I do not say that you read and follow the steps as it should help you solve your problem.  Please let us know if you need more assistance.
Thank you

Microsoft Answers Support Engineer
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Tags: Windows

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