Depending on the setting you choose, Windows automatically downloads and installs any high-priority updates that your computer needs, or notifies you as these updates become available.
Installation: You do not have to be connected to the Internet for Windows to install new updates.
But updates must be installed, not just downloaded, before they can help protect your computer.
If you prefer to download and install updates yourself, you can also set up Automatic Updates to notify you whenever any high-priority updates become available. If you have not turned on Windows Automatic Updates, your computer is more vulnerable to viruses and other security threats.
When you turn on Automatic Updates, Windows routinely checks the Windows Update Web site for high-priority updates that can help protect your computer against attacks.
Other updates might require you to restart your computer before the installation process can be completed.
If you are an administrator for your computer, you can delay the restart.When you turn on Automatic Updates, you don't have to search for updates online or worry that critical fixes might be missing.Windows automatically downloads and installs them for you, using a schedule that you determine.Otherwise, Windows notifies you and then restarts your computer for you so the updates can begin to help protect your computer.It is always a good idea to save your work frequently, and to remind other users of your computer to save their work, especially before scheduled installation times.(Windows does not use your name, address, e-mail address, or any information that can be used to identify you or contact you!