I've seen the same has happened to others re: product #

Click on Validate Windows (right side)  and post any error code you receive.

If applicable:

Click on Validate Microsoft Office (right side) and post any error code you
receive
http://www.microsoft.com/genuine/

WGA Diagnostic Site - re: product ID - You should receive a solution
regarding such.
http://www.microsoft.com/genuine/diag/

If the Office Source Engine Service is
disabled, you will not be able to install these updates. Here are two methods
for handling the issue.

1. Open Office Help and search for "office source engine"

C:\Program Files\Microsoft Office\OFFICE11\1033\SETUP.CHM

Set the Startup Type to "Manual"

If you disable the Ose.exe file, Microsoft Office updates do not install
when you use Microsoft Windows Server Update Services or the Microsoft Update
Web site to deploy software updates and hotfixes to computers in the
organization
http://support.microsoft.com/kb/903774/en-us

You cannot install an Office 2003 service pack
http://support.microsoft.com/kb/884298

Check in these folders for possible downloaded files - J. Brush
C:\Users\$user$\AppData\Local\Microsoft\Windows\Temporary Internet Files\Low
C:\Users\$user$\appdata\Local\VirtualStore

Where $user$ is your username.

And lastly, perform a system restore prior to the download issue.