First see:

Description of the update for Office 2003 (December 9, 2008)
http://support.microsoft.com/kb/949074

Firas Naji wrote:
> I can't seem to get any of the Outlook Junk E-Mail Filter Updates to
> install. They download properly, but will not install. The latest Filter
> Update is KB970011
>
> I've tried the following:
> Installing manually.
> Re-Installing Office 2003
> Outlook Detect & Repair
> Stopping & Restarting the automatic update svc
> Hitting the PC with a hammer....
>
> Still won't install.