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The Queen has almost no power at all.
The Queen cannot just choose anyone to be Prime Minister, the person she chooses is the leader of the strongest party in the Commons. It is really the Prime Minister who decides who the other government ministers are going to be. While in theory the Queen could refuse the royal assent to a bill passed by Parliament, no monarch has actually done since 1708, and the royal assent is automatic, the queen doesn't even bother to sign the documents.

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Windsor is the family name of the British royal family.  Queen Elizabeth is only the fourth monarch with this name. Because her grandfather, changed the family name. It was SaxeCoburg-Gotha, but because of the First World War they thought it best if the king did not have a German sounding name.

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The Queen has almost absolute power.
As far as the law is concerned, she can choose anybody she likes to run the government for her. There are no restrictions on who she picks as her Prime Minister. She also can dismiss them. In addition, nothing that Parliament has decided can become a law until she has given it the royal assent.
When someone is accused of a crime, it is The Crown who accused this person, and if is found guilty,  he or she is sent to one of "Her Majesty’s" prisons.