What would happen if a computer was turned off during a Windows update?

Kamil November 16, 2011
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What would happen if you turned off your PC (for example a power failure) during installing Windows updates when it states Do Not Turn Off Your Computer?

  1. josh
    November 26, 2011 at 2:50 am

    I'll tell you one thing, you don't want that to happen to your domain controller. Happened to me a month ago. I was using Acronis for backup software... That didn't want to restore. As the only admin, that meant a few days of solid work for me.

  2. Jeff
    November 16, 2011 at 2:32 pm

    Hi Kamil,

    It depends exactly what update it was and what it was doing at the time. In most cases, either the update doesn't fully install (corrupted) or it simply resumes on the next startup or shutdown. If the installation is corrupted, Windows is usually able to detect it and either revert the changes, or request that you manually re-install the update.

    - Jeff

    • Bruce Epper
      November 16, 2011 at 10:26 pm

      And depending on what file(s) were being updated/modified at the time, you could end up with a system that will no longer boot forcing you to go to the DVD to revert to a previous restore point or perform a repair/reinstallation.

  3. Anonymous
    November 16, 2011 at 2:08 pm

    The update is not installed successfully
    http://support.microsoft.com/kb/949358

    you can use a restore point, Select the date prior to when the computer was turned off during the updating process. Normally windows update has to create a restore point prior installation.