Re: KB2949927 Microsoft Security Advisory: Availability of SHA-2 hashing algorithm for Windows 7 and Windows Server 2008 R2 https://support.microsoft.com/kb/2949927
This update has been removed from the Download Center because of an issue with the update. Microsoft is researching this problem and will post more information in this article when the information becomes available. We recommend that customers who are experiencing issues with this update uninstall this update.
To do this, follow these steps:
1.Click Start, click Control Panel, click Programs and Features, and then click View installed updates.
2.Select "Security update for Microsoft Windows (KB2949927)" and then click Uninstall.
Remark: I have "successfully" installed this update. I don't see any details/explanation of the nature of the "issues", so I don't know what to look for. Nothing "obvious" is happening... so I'm leaving things "as is" for the moment.
See also http://www.infoworld.com/article/2834930/security/microsoft-yanks-botched-patch-kb-2949927-re-issues
contains a discussion of 4 potentially "botched" patches released this month.