this setting will only affect anamorphic dvds played on a 4:3 (1.33:1) tv. this setting should not affect widescreen or letterboxed dvds.
to change the widescreen dvd option, follow these steps:
note: this option is not always available in the menu. it will appear only when widescreen tv is set to "no." for instructions on how to change the aspect ratio, see changing media center aspect ratio.