Microsoft Knowledge Base Article 327838 contains the following summary:
If you are
logged on as an administrator,
the Automatic
Updates feature in Windows notifies you when critical updates are available for
your computer.
There is a new Automatic Updates feature that you can use to
specify the schedule that Windows follows to install updates on your computer.
This article describes how to install this new Automatic Updates feature in
Microsoft Windows XP and Microsoft Windows 2000 and how to use it to schedule Automatic
Updates.
Note
This new Automatic Updates feature is included with Microsoft Windows Server 2003.
For additional
information about how to configure other Automatic Updates settings in Windows
XP,
click the article number below to view the article in the Microsoft
Knowledge Base: