After latest update I cannot get past the scenery picture. [Closed]

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After the latest Windows 10 update I cannot access anything on my laptop. I get the ever so pretty scenery picture and then what is an unusual request for a pin. I enter the only pin I have which is usually how I open windows but it won't accept it. I tried entering my Microsoft password but it won't accept letters. this is a whole new request at the start of opening Windows it's never been there before and I can't get online to change my password what can I do please