In Windows 10, Windows Update is found within Settings.
First, tap or click on the Start menu, followed by Settings. Once there, choose Update & security, followed by Windows Update on the left.
Check for new Windows 10 updates by tapping or clicking on the Check for updates button.
In Windows 10, downloading and installing updates is automatic and will happen immediately after checking or, with some updates, at a time when you're not using your computer.
In Windows 8, Windows 7, and Windows Vista, the best way to access Windows Update is via the Control Panel. In these versions of Windows, Windows Update is included as an applet in Control Panel, complete with configuration options, update history, and more.
Open the Control Panel and then choose Windows Update.
Tap or click Check for updates to check for new, uninstalled updates. Installation sometimes happens automatically or may need to be done by you via the Install updates button, depending on what version of Windows you're using and how you have Windows Update configured.
Microsoft has released a free update for Windows XP, even though it is out of support and end-of-life.
Follow the instructions provided by Microsoft in the following link: