Windows 8: Prevent Windows Update from Restarting PC
Seeing the “PC will restart in 15 minutes to complete the update” window can be a nuisance. The simple registry hack described in this tutorial will remove it.
Please note that removing this window means that your update will not be completed until you manually restart your PC. This registry hack puts you in power to restart your PC on your own time. Also, do not attempt to change the registry if you do not know what you are doing. Modifying some folders can be fatal to your PC.
2.With the registry open, navigate to the following:
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