You can download updates for Windows XP from the Windows Update Web site.The Web site will identify which of the available updates need to be installed on your system.
That's why you should set your computer to look for available updates on a daily basis.
Please note that if your PC is not turned on (or not connected to the Internet) at the scheduled update time, Windows will still check for updates the next time you start or restart your computer.
Note: Microsoft made changes to the location and wording of Windows Update and its settings almost every time a new version of Windows was released. Beginning in Windows 10, Microsoft simplified the options available to you regarding the Windows Update process but also removed some of the finer control you may have enjoyed in earlier versions.
Below are for changing/disabling Windows Update in Windows 10, Windows 8, Windows 7 or Windows Vista, and Windows XP. Here are more details on all the "advanced" Windows Update settings that are available to you in Windows 10: Automatic (recommended): Choose this option to automatically download and install updates of all kind, both important security patches as well as not-as-important non-security updates, like feature improvements and minor bugs.
Clean installations without Service Pack 1 might fail to start BITS and Windows Update services.
Either use the link above to download SP1 (the huge ISO file in the list applies to all Windows 7 computers), or use free WSUS Offline Update to download and install all necessary prerequisites, SP1 and latest security updates.
Automatic Updates is a feature of Windows Update added as of Windows ME.
It allows users to have their computers install important updates automatically, without visiting the Windows Update website or opening the client.
Windows 8 (not 8.1) users must upgrade to Windows 8.1 or 10 to continue receiving security updates after 12th of January, 2016.