Do Not Show First Use Dialog Boxes
This policy prevents the Privacy Options and Installation Options dialog boxes from being displayed the first time a user starts Windows Media Player.
This policy prevents the dialog boxes which allow users to select privacy, file types, and other desktop options from being displayed when the Player is first started. Some of the options can be configured by using other Windows Media Player group policies.
When this policy is not configured or disabled, the dialog boxes are displayed when the user starts the Player for the first time.