My OS is Windows XP. Recently all my photos (thousands which were saved as .JPG)have migrated to my Display Properties "Desktop" tab as "Background" photos. I cannot delete them there. If I try to delete any "Background" photos anywhere else, my entire picture file is then also deleted. Their sheer number makes it impossibly slow to change the image on the screen, as I like to do. I searched "Wallpaper" to no avail. Can anyone help?