A fix for when Windows 8.1 (RT) and Server 2012 R2 December 2013 update rollup (KB2903939) fails to install

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On 12th December 2013, Microsoft released Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 update rollup: December 2013 – KB2903939 which will be offered to most folk via Windows Update.

There are reports that this update is failing with neither the Windows Update troubleshooter or the alternative DISM.exe /online /cleanup-image /restore health e.t.c. (that the troubleshooter suggests as an alternate approach) fixing the problem.

All the usual caveats apply – so don’t sue me … but if you are similarly affected, try this:

1. Download KB2903939 as a standalone from here: http://www.microsoft.com/en-us/download/details.aspx?id=41294 (if you have a 32bit – X86 install, you need this instead)

2. Actually download BOTH the subsequently offered Windows8.1-KB2903939-x64.msu AND Windows8.1-KB2911134-x64.msu

3. Run Windows8.1-KB2911134-x64.msu – (but NOT Windows8.1-KB2903939-x64.msu)

4. Spin up Powershell (type “Powershell” in an admin DOS cmd prompt).

5. In the Powershell prompt, run each of these commands:

set-service trustedinstaller -startuptype Disabled

reg load HKLM\COMPONENTS $env:windir\system32\config\COMPONENTS

Remove-Item -Path HKLM:\Components\DerivedData\VersionedIndex\* -Recurse

reg unload HKLM\COMPONENTS

set-service trustedinstaller -startuptype Automatic

6. Run Windows8.1-KB2903939-x64.msu (that you downloaded in step 2)

7. Restart – when prompted.

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