Microsoft ended support for Windows XP this week, but the company will still provide updates for Microsoft Security Essentials (MSE) for a limited time.
This will give XP users a bit more time to keep their computer secure until they can decide their options for moving on.
You won't even be told that updates are available.
Allow all users to install updates on this computer: Check this if you have other, non-administrator accounts on your computer that actually get used. However, even when unchecked, updates installed by an administrator will still get applied to those user accounts, they just won't be able to install them.
Give me updates for other Microsoft products when I update Windows: Check this option, which is a bit wordier in Windows 7 & Vista, if you own other Microsoft software and you want Windows Update to handle updating those as well.
Show me detailed notifications when new Microsoft software is available: This is pretty self-explanatory—check it if you want to get notifications, via Windows Update, when Microsoft software you don't have installed is available for your computer.
Download updates for me, but let me choose when to install them: Updates will be checked for, and downloaded, from Microsoft's servers, but they won't be installed until you manually approve them.
Notify to schedule restart: Choose this option to automatically download updates of all kind—security, and non-security.
Updates that don't require a restart will install right away but ones that do won't restart your computer without your permission.
Participating in the Check for updates but let me choose whether to download and install them: With this option, Windows Update will check for and notify you of available updates but you'll need to manually approve the download and installation of them.
Never check for updates (not recommended): This option disables Windows Update completely in Windows 8, 7, or Vista.
According to an article on the MSDN blog: If you already have Microsoft Security Essentials installed, you will continue to receive antimalware signature updates for a limited time, but this does not mean that your PC will be secure because Microsoft will no longer provide security updates to help protect your PC.
Microsoft was vague on exactly how long antimalware updates will be provided to MSE.
Of course you can still download Security Essentials for Windows 7 and it’s rolled into one antimalware and antivirus utility in Windows 8.1 under the familiar name Windows Defender.