User Configuration\Administrative Templates\Windows Components\Internet Explorer
Prevents branding of Internet programs, such as customization of Internet Explorer and Outlook Express logos and title bars, by a third party.
If you enable this policy, it prevents customization of the browser by a third party, such as an Internet service provider or Internet content provider.
If you disable this policy or do not configure it, users could install customizations from a third partyùfor example, when signing up for Internet services.
This policy is intended for administrators who want to maintain a consistent browser across an organization.