See: Install KB3024777 to fix an issue with KB3004394 on Windows 7 and Windows Server 2008 R2
"The KB 3004394 update that was dated December 10, 2014 can cause additional problems on computers that are running Windows 7 Service Pack 1 (SP1) and Windows Server 2008 R2 SP1. This includes the inability to install future updates. This new update is available to remove KB 3004394 from your computer."
Continued : https://support.microsoft.com/kb/3024777
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Regarding KB3004394 : December 2014 update for Windows Root Certificate Program in Windows
Noted under "Issue for Windows 7 SP1 and Windows Server 2008 R2 SP1":
"The KB 3004394 update does not cause any known problems on the other systems for which it is released. We recommend that you install the update on the other systems.
If you have not yet deployed KB 3004394 on Windows 7 SP1-based and Windows Server 2008 R2 SP1-based computers, we recommend that you delay installation until a new version of this update becomes available.
If you have already installed KB 3004394 on Windows 7 SP1-based and Windows Server 2008 R2 SP1-based computers that were not restarted after the update was installed, we recommend that you delay the restart if it is possible until more information is added to this article about a method to remove the update.
If the installation of KB 3004394 is causing problems on these computers, remove the update, and then restart the computers. The ability to remove Windows Updates through Control Panel may no longer function on some Windows 7 SP1-based and Windows Server 2008 R2 SP1-based computers after KB 3004394 is installed. "
Continued : https://support.microsoft.com/kb/3004394

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