Why can't I change a setting in Internet Explorer 9

If your computer is part of a network at an organization such as a school, government agency, or business, your organization's system administrator might have disabled or even removed certain Windows Internet Explorer settings by using Group Policy. Group Policy is a Windows feature that system administrators can use to manage access to other Windows features. If you suspect that Group Policy is preventing you from changing a setting that you need to access, contact your system administrator.