The right operating system (OS) can make the difference between a functional computer and one in need of an upgrade. Software affects all of a device's processes and can improve its functionality. Every user should work with an OS that they are comfortable with and can navigate easily. Microsoft Windows and its many versions have maintained steady levels of popularity due to their familiar menus, tools and interfaces. For example, the previous two Windows OS's, Windows 7 and Windows 8, have kept user-favorite features while upgrading other content. Windows 7 has been a popular Windows OS due to its intuitive design, which is much more user-friendly than that of previous generations. On-screen navigation has been simplified with a larger, customizable taskbar, so popular applications can be opened with only a single click. While there are many versions of Windows OS's, the Ultimate version offers increased security and data backup. The OS comes with BitLocker, a hard drive encryption program. Windows 7 Professional offers advanced storage, as well, which prevents unsaved documents from being lost during hardware malfunctions. Windows 10 is the latest version of Microsoft's flagship operating system. The platform features cross-platform app compatibility that have been optimized for use on PC, Tablets, Surface and Xbox One.