To reset your operating system back to original installation default security settings: 1.Click Start, click Run, type cmd, and then press ENTER.2.For Windows XP, type the following command, and then press ENTER:secedit /configure /cfg %windir%\repair\secsetup.inf /db secsetup.sdb /verbose
For Windows Vista, type the following command, and then press ENTER:secedit /configure /cfg %windir%\inf\defltbase.inf /db defltbase.sdb /verbose
You receive a "Task is completed" message, and a warning message that something could not be done. You can safely ignore this message. For more information about this message, view the %windir%\Security\Logs\Scesrv.log file. Note In Windows Vista, the defltbase.inf file is a Security configuration template for the default security. You can view the settings for this file in the following location: %windir%\inf\defltbase.inf