Last night I turned it off and when I turned it on this morning it had the windows welcome screen(Usually it loads right into desktop), and said it had recovered from a serious error(Shutdown normally as far as I know). Also when I want to open my task manager(ctrl+alt+del) it brings me to the lock, log, shutdown, task manager select screen. Was there like some weird Microsoft security update? Or is my computer possessed? Or am I sleep computer tweaking?