Since the very early days, Windows has had a "safe mode" startup option. This loads a minimal set of features and drivers, which means that there's a good chance of an otherwise unresponsive system starting up. You can then, so the theory goes, fix any problems (such as removing broken device drivers) before restarting again in full-on mode.
In Windows 10, this special startup functionality is much more powerful, and offers some useful features. In addition to letting you restart in safe mode with or without networking, for example, you can also disable the operating system's refusal to install a device driver that has not been digitally signed by the vendor. This is especially handy if, say, you're trying to install Windows 10 (or upgrade to it) on relatively old hardware for which modern, signed drivers do not exist. This will avoid any error messages you would otherwise receive about Windows refusing to install a driver.
To reach the new magic restart menu, do the following:
From the Start menu, choose Settings.
Click on "Update and Security"
Select "Recovery" from the left hand column, then click on Restart Now.
Wait a while, and another menu will appear.
Click on Troubleshoot
Click on Advanced Options
Click on Startup Settings
Click on Restart
Your PC will now reboot, but you'll be presented with a list of options. Choose one, or just press Return to restart normally.
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