To install this security update, you must have Service Pack 1 for SharePoint Server 2013 installed on the computer.
You may have to restart the computer after you install this security update.
In some cases, this update does not require a restart. If the required files are being used, this update will require a restart. In this case, a message is displayed that advises you to restart.
To help reduce the possibility that a restart will be required, stop all affected services and close all applications that may use the affected files before you install this security update. For more information about why you may be prompted to restart the computer, see the following Microsoft Knowledge Base article:
887012 Why you may be prompted to restart your computer after you install a security update on a Windows-based computer