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Every now and then, when I am at the login screen after some time away from my pc, the windows login tells me my password is incorrect? It is a very simple 4-digit password, I'm not typing it in incorrectly, it just won't accept it. I have to restart my computer and then I can log in just fine. How can I fix this?

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You don't say if it is s desktop or laptop, but my first thought was a bad keyboard. Try replacing it, although it is harder if you have a laptop. – KCotreau Jul 19 '11 at 11:40
It's a desktop. I'll try a different keyboard... – Amanda Jul 19 '11 at 13:34
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2 Answers

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Make certain that caps lock and numlock keys have not been pressed to change shift level. That is the most likely explanation. Someone else could even have pressed those keys.

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I did check. The password is just numbers, and I tried using the numeric keypad (with numlock on and off, just for fun), and the numbers at the top of the keyboard, with no success. StickyKeys are turned off, and no-one was holding down the shift key. – Amanda Jul 19 '11 at 9:40
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I had this kind of problem a while back on Windows 7; it almost made me pull my hair and teeth out.

Then I changed the passwords for my admin and user accounts and the problem went away. Something must have corrupted some system files or database, whatever it was.

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