When you install an update by using the Windows Update Stand-Alone Installer (WUSA) in Windows 8 or Windows Server 2012, WUSA may occasionally freeze. This causes the update installation to fail.
To resolve this issue, install update 2955163. For more information about how to obtain update 2955163, click the following article number to view the article in the Microsoft Knowledge Base:
2955163 Windows RT, Windows 8, and Windows Server 2012 update rollup: May 2014
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates