For now, the quick fix is System Restore (what and how is on the web as well in Windows own help system.)
Hello, I unfortunately uninstalled something like c2chdk or something sounds like that and after that moment windows lock screen does not work. It was quite good to have it "locked" even without password to see a nice picture, but nowadays after starting I see instantly desktop instead of that lock screen and when pc is inactive it is same. I have win 10 Home. Thank you!

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