Determining the version of Windows XP installed on a computer can be useful for troubleshooting, compatibility checking, and security purposes. There are several methods to check the version of Windows XP, including using the System Properties dialog, the Command Prompt, or the Registry Editor.
One of the simplest methods is to open the System Properties dialog. To do this, right-click on the My Computer icon on the desktop and select Properties. In the System Properties dialog, the version of Windows XP will be displayed under the General tab.