You should simply reinstall the driver for the net card.
A device driver is not installed, or a hardware device does not function
correctly after you install Windows Vista Service Pack 1:
http://support.microsoft.com/?kbid=948187
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Mark L. Ferguson
..
"Solvetech" <(E-Mail Removed)> wrote in message
news:d73e6c15-3f79-44c3-81a6-(E-Mail Removed)...
> Has anyone else had problems with windows updates released in April
> 2008 for the Vista platform?
>
> I have several PCs running Vista SP1 and using ForeFront security
> client. Following a restart after windows updates were applied none of
> the PCs running Vista SP1 and using ForeFront security client could
> access either the internet or the local network. It was as though the
> network card was disabled.
>
> I have other Vista SP1 systems that are not using ForeFront and they
> are fine. This leads me to suspect that it is the combination of
> ForeFront and Vista SP1 which is the cause.
>
> To resolve the issue we used system restore to revert to a state prior
> to the Windows update but I would like to understand what has happened
> here. I do not know if reapplying the updates breaks the system again.
>
> Regards