Use the Check boxes section of the Visual options dialog to customize the border style and the appearance of check boxes and radio buttons.
This setting determines the manner in which check box and radio group borders are painted. Use the drop-down list to select the painting style that will be applied to the check boxes and radio groups:
If this option is selected, a shadow is displayed for the check boxes and radio groups.
This option determines whether the native Windows style will be applied to the check boxes and radio buttons.
The option has the highest priority for check boxes and radio buttons. If this option is selected, the check boxes and radio buttons are painted according to the native Windows style, regardless of other painting settings.
Note: The Native style option is currently supported for the Windows® XP operating system only.