This software prevents automatic reboot after Windows updates by installing a service that updates active hours in the background, enabling the operating system to refrain from rebooting while you work.

According to a review by German computer magazine c't (as of 01-21-2017 edition 03/2017), Ulrich Decker's RebootBlocker is the ultimate solution for unwanted reboots. By running a constant update of the 'active hours' every hour, this program is the best defense against unexpected and frustrating computer restarts.
If you're constantly dealing with the annoyance and disruption of unexpected restarts, don't waste any more time searching for a solution. The RebootBlocker tool is the only reliable and effective fix on the market.
Version 1.1: First release