New
#21
You appear to be stuck with Photos open and occupying the whole screen. Any app should (if windows is working at all) close with Alt+F4. Photos certainly will on a system that's functioning normally.
If by some miracle that closes Photos you may still be left with a Start menu that's non-functional. If so, you can close Windows by clicking on the desktop and using Alt+F4 again (it's the universal 'close' key).