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I have often go on a round but can't stop downloading many other people are in the same room how do I lock the screen?

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Win+L will lock the screen, but only if you have set up a password for your account.

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I have locked the screen of a computer that didn't have a password before. It kind of defeats the purpose though. If someone wanted to try a password and click on your user name, it would just log them in. "Windows key" + "L" will work whether or not you have a password. – David Feb 16 '11 at 12:58

Press Windows-L

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