Windows 10 brings back the Start Menu, which organizes all of the tiles that were abundant in Windows 8. Windows 10 boots straight to the desktop, and it stays there. Internet Explorer is taking a backseat to a new and improved Web browser. Microsoft's Siri-like Cortana voice assistant will live in the task bar. You can run multiple desktops. A new notification and "action" center gives you a quick glance at your PC's status. And you can even unlock Windows 10 with facial recognition software.