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.
For more information about the KB 3004394 update, see the following Microsoft Knowledge Base article:
3004394 December 2014 update for Windows Root Certificate Program in Windows