Windows Vista DVD Library/Play DVD Option Missing

[user080608]

In the HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Media Center\Settings\DvdSettings section of the registry, I changed the ShowGallery key from "Play" to "Gallery" to change the Play DVD option to DVD Library. The action worked, and everything was working properly. At some point, the DVD Library option disappeared and I haven't figured out how to restore it. I am using Vista Home Premium SP1. Unfortunately, I don't recall whether the DVD Library option disappeared with the installation of SP1. Does anyone have any ideas how I can get the DVD Library (or Play DVD) option back?

 

[kemical]

System restore?

 

[user080608]

I know it's not a terribly tedious process, but I was hoping to find the setting that handles this option instead of restoring the OS.