Windows XP is the most widely used version of the Windows operating system. It uses a graphical user interface with icons, menus, and a mouse. Some key features of Windows XP include an updated user interface, easier file management, support for multiple users and processors, plug-and-play capabilities, and tools for digital media and internet browsing. Files and folders can be created, renamed, copied, moved, and deleted using Windows Explorer. The desktop, themes, wallpaper, and other settings can be customized. If issues arise, troubleshooting techniques like checking configurations, modifying settings, and using Windows Help can be used. The Recycle Bin allows restored deleted files, while Windows Defender protects the computer from malware.