Windows Update can't install Windows Vista SP1

Posted by Harry Johnston on Super User See other posts from Super User or by Harry Johnston
Published on 2012-11-01T19:51:47Z Indexed on 2012/11/01 23:06 UTC
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If you install Windows Vista RTM and run Windows Update, many updates are offered and will successfully install. Once all other updates are installed, Windows Vista service pack 1 is offered.

When you attempt to install Windows Vista service pack 1, the service pack installation wizard appears, presenting the license agreement and so on. However, shortly after the installation starts the wizard disappears. Windows Update says that the update was installed successfully. However, service pack 1 is not in fact installed, and will be detected as needed again on the next update check. Repeat ad nauseum.

On checking the Windows Update log, error 0x80190194 appears near the beginning of an update check, associated with the URL http://update.microsoft.com/vista/windowsupdate/redir/vistawuredir.cab.

Why won't service pack 1 install properly and how do I fix it?

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