You don't have to be a hardcore computer nerd to know that you should only download reputable applications and scan them for viruses before installing. Unfortunately, by default, Windows 10 thinks you're a baby that needs to be severely warned every time you try to do an app or tweak setting.
Two different Windows features combine to infantalize you. User Account Control (UAC) warns you when you install programs or change important system settings. SmartScreen Filter tries to stop you from installing programs that Microsoft hasn't heard of before, which includes a lot of Open Source programs.
To disable UAC, navigate to the Security and Maintenance control panel menu; you can get there by typing "Security and Maintenance" into the Cortana search box. Then click Change User Account Control and slide the slider down to the bottom option ("never notify"). Turn off SmartScreen Filter by clicking on "Change Windows SmartScreen settings" from the "Security and Maintenance" menu and then selecting "no" on the pop-up which appears.