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After you upgrade the system from Windows 8 to Windows 8.1, CPU usage may frequently be high and the system may sometimes freeze during shutdown. Even when the computer is idle, the CPU usage may exceed 40%.


This issue occurs because the Windows Backup Process (SDCLT.exe) keeps starting itself.


To resolve this issue, install update 2919355. For more information about how to obtain update 2919355, click the following article number to view the article in the Microsoft Knowledge Base:

2919355 Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update April, 2014Note The problem described in this article may occur when you restart your computer to apply the hotfix. After restarting, the old files will be replaced, and the problem will not occur afterward.


To work around this issue, follow these steps:

  1. Press the Windows key to go to the Start screen.

  2. Type Schedule tasks, and then click Schedule tasks.

  3. On the navigation pane, expand Task Scheduler Library, Microsoft, Windows, and then click WindowsBackup.

  4. Right-click the ConfigNotification task, and then click Disable.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

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

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