You run some driver that forbids the sp1 install.
Windows Vista Service Pack 1 is not available for installation from Windows
Update and is not offered by Automatic Updates:
http://support.microsoft.com/?kbid=948343
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Mark L. Ferguson
..
"Adrian Harding" <Adrian
> wrote in message
news:39D88045-0BF3-4EBC-8920-...
> my windows update located SP1 update, it downloaded and fails at start of
> install with error code 800704C8, further attempts to install come with
> same
> error message but without attempting download, i assusme file is somewhere
> on
> machine. Am downloading full 400mb version, but worried about using at
> present in case something is wrong with machine.
>
> Any ideas what problem with windows update is.