In Settings / Personalization and choose Lock Screen and choose a static picture or slideshow. Update your video card drivers and reboot. Then go back into Settings / Personalization and select Lock Screen. Choose Windows Spotlight and close. Then test the lock screen by pressing CTRL-L. The lock screen should have an image with the time and, if selected, apps displaying info such as weather. Then when you click the mouse to enter password, that image should reflect the lock screen image as well.