Windows update error: The updatebr.inf file is invalid.

Windows 2003 server sp2 Domain Controller

Windows Automatic updates configured to Download only, so the system downloads KB2607712, but fails to install.

When I do a 'bing' search for "KB2607712" I get an M$ site with a download for the KB, but then when I go to run the exe I get the following error:
The updatebr.inf file is invalid.

Although the site lists this update as being for XP sp3 and other searches on Google for the error often indicate that it appears when attempting to install an update on the wrong OS, I am doubting this is the cause of my particular instance of the issue since the update shows as being installed on other DCs.

What can I do to resolve this issue and get the update installed?
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