I found the answer in this thread
http://www.microsoft.com/windowsxp/e...=en-us&m=1&p=1
"Steve Schwab" wrote:
> OK, I confirmed that the daylight saving time update was not installed in the
> registry. I was able to use timezone editor utility from Microsoft to
> manually set the correct time zone dates for EST and now the time displays
> correctly. I'd still like to find a way to install KB931836 so that all the
> other time zones are correct as well. So I'll ask again...how do you force
> an update even if windows thinks its already installed. Is there a registry
> setting that I can delete or something like that. As stated before, the
> update is not listed in add/remove programs (yes, I have "show updates"
> selected).
>
> Any help would be appreciated.
>
> "Steve Schwab" wrote:
>
> > I have an XP pro client on an SBS 2003 network that is not updating to
> > daylight savings time. I recently had to do a repair install on the system.
> > After the repair I updated using windows update. I don't see KB931836 (the
> > recent daylight savings patch) in the add/remove programs. I downloaded the
> > KB and tried to install it but it told me I already have the update installed
> > or a newer update installed. I also checked to see if KB933360 was installed
> > but could not find it.
> >
> > How can I force windows to reinstall the update?
> >
> >