Don't worry, it's all deleted, no problem. Windows installation patch backup files are automatically backed up when installing the system, which is useless. When you open some system files, the Windows Help file will be closed. There is a question mark next to it. That question mark is the corresponding help file. Most people who use that thing for consultation can also be deleted. The third wallpaper is made by windows itself, which is generally not good-looking, and it is also recommended to delete it. The last one is some useless installation files, that is, you did not delete some installation programs when you installed the software. Why install the program when you have installed the software? So don't worry, delete them all!