This command sets the default entry that the boot manager will use when the timeout expires. bcdedit /default Specifies the ...

This command sets the default entry that the boot manager will use when the timeout expires.  bcdedit /default           Specifies the identifier of the boot entry to be used as the             default when the time-out expires. For information about             identifiers, run "bcdedit /? ID".  Examples:  The following command sets the specified entry as the default boot manager entry:      bcdedit /default {cbd971bf-b7b8-4885-951a-fa03044f5d71}  The following command sets the NTLDR based OS loader as the default entry:      bcdedit /default {ntldr}