Can't give password after installing updates


Last night I've installed the last updates for windows 7. But when I started my pc this morning I can't come any further than the login screen. I can't type anything in the password field, if I for example pres 'h' it does nothing. Only when I press backspace there comes a circle in the field. So immediately I tried another keyboard, but it didn't help. What can I do about this problem?

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