Note to enable or disable the "User Account Control" (UAC) you should have administrative privileges.
To enable or disable UAC you will require to launch the UAC Settings dialog. You can launch the UAC Settings dialog by following ways:
1. From Start menu, open Control Panel. Go to "System and Security", under "System and Security" select "Action Center". On the "Action Center" windows, click "Change User Account Control Settings" link present at left side of panel as shown below.
2. On the Run prompt or command prompt type UserAccountControlSettings.exe and hit enter.
3. Alternatively you can launch MSConfig.exe utility, go to "Tools" tab. Select "Change UAC Setting" tool and click launch.
Now on the UAC setting dialog, set the notification level to "Never Notify".
Note that setting this level will never warn you of any administrative action that is being taken by any Windows 7 certified program.