Microsoft made updating Windows more complex with the advent of Windows 10. How you update Windows now depends on what version of Windows
For Windows 10, click the Windows icon at the bottom left corner of the screen, click Settings (or the icon that looks like a cogwheel —
click Update and Security, and click on the button to check for updates.
For older versions of Windows, either use the Windows Update function, or use Internet Explorer to go to
the Windows Update website.
In either case you will have to restart Windows after the update.