Just to post it at time, Im checking it:
http://www.microsoft.com/downloads/d...n&Hash=YYCGHT7
Update for Windows Server 2003 Service Pack 1 (KB898715)
This fix addresses the issue with Windows Installer 3.1 and
installation of system protected files described in KB Article #898715.
Overview
Before the release of Windows Installer 3.1, during a silent
installation process, a package could not install a later version of a
file that was protected by the Windows File Protection (WFP) feature.
However, the installation process would continue and would report as
successful.
With the release of Windows Installer 3.1, this behavior has changed.
In version 3.1, the silent installation process does not succeed and
then rolls back the installation if the silent installation process
cannot install the WFP-protected file. To resolve this problem, obtain
the KB160810 update package.