I wouldn't be able to say exactly why your keyboard settings changed like this, but if you are using a shared computer, then it's possible that another user of the computer changed the setting to match their own keyboard. If this happens again and you are certain that no one else changed the setting, it could be another program on your computer changing the setting. A virus scan may be able to identify and remove the offending program if that is the case. If your computer is part of a Workgroup, the Workgroup may have overridden your personal settings. If this is the case then you will likely need to contact your network administrator to resolve this problem.
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