If your systems have the Professional, Enterprise, or Ultimate edition of Windows 7 installed, you can use the Local Security Policy console to modify the behavior of UAC. Start Local Security Policy (Secpol.msc) and open Security Settings\Local Policies\Security Options. In the details pane, scroll down to the policies whose names begin with “User Account Control.” For each policy, double-click it and click the Explain tab for information before you decide on a setting.
With these 10 policies, you can make several refinements in the way UAC works—including some that are not possible in the User Account Control Settings window. For details about each of these policies, see UAC Group Policy Settings and Registry Key Settings in the TechNet library.