Package updates "Patch Tuesday" an important mechanism for Microsoft to repair gaps in systems, software and software compatible with it, but it seems that the Update December carrying with him the problems at one of these updates, which cause problems in Windows.
And it is also known that Microsoft deliberately each month to launch Patch Tuesday updates package to address technical problems or vulnerabilities that may threaten its products on the Internet, but it is clear that the current December package current has caused problems for some users.
Microsoft had a Patch Tuesday and package updates is update KB3004394 caused to users of both Windows 7 SP1 and Windows Server 2008 R2 SP1 on a range of issues, including preventing install triggers new AMD graphics cards and Nvidia as it affects the Windows Defender and a range of other programs and prevents the completion of the rest of the updates.
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the corrective update: https://support.microsoft.com/kb/3004394/en-us