How to Disable User Account Control in Windows Vista/Windows 7 to enable Call Manager Installation.
UAC or User Access Control is a new feature of Windows that is meant to enhance the security of your system. Each time an application is installed or whenever an important system change is made by the user or by a running process, the screen is blacked out and temporarily disabled and a dialog is shown with the choices to allow or deny the action. If the logged user is not an administrator, Windows Vista will also ask for the administrator password. While this helps keeping your system safer from threats, it can also be very annoying and sometimes confusing. In this guide we will show you how to disable this feature of Windows Vista. Before we start, we must remind you that disabling UAC is not recommended by Microsoft because it can expose you to a lot more security threats. If you still choose to disable it please make sure you have proper security in place for your system. To disable the UAC, enter the Control Panel and type UAC in the search box. The first result returned by the search will be User Accounts – Turn User Account Control (UAC) on or off.
Click on it and the UAC window will open. Deselect the option Use User Account Control (UAC) to help protect your computer and press the OK button.