Keyboard and mouse functions suddenly changed?

My keyboard and mouse setting suddenly changed. The letters won’t type anything and the mouse was only resizing my window display. I pressed random buttons and it just locked my pc.. and the on screen keyboard won’t type anything now either. Can’t log back in. The u button brings up the accessibility screen and the... show more My keyboard and mouse setting suddenly changed. The letters won’t type anything and the mouse was only resizing my window display. I pressed random buttons and it just locked my pc.. and the on screen keyboard won’t type anything now either. Can’t log back in. The u button brings up the accessibility screen and the p button brings up this screen output menu... please help
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