On the Select a power plan page, click Change plan settings next to the selected plan. Here's how to prevent your computer from entering a power-saving state: Open Power Options by clicking the Start button, clicking Control Panel, clicking System and Security, and then clicking Power Options. In this manner, how do I stop my computer from shutting down automatically? Shutdown settings -> Uncheck Turn on fast startup (recommended) -> OK.Start -> Power Options -> Choose what the power buttons do -> Change settings that are currently unavailable.