The User Account Control is a very important part of Windows security and is responsible for all those times a dialog box pops up asking you to verify an action. Although the User Account Control is turned on by default, people sometimes find it so annoying that they turn it off. This action reduces your security and makes it much more difficult to execute actions while you’re logged on as a Standard user.
Click the Start button, choose Control Panel from the Start menu, and, in the Security section, click Check This Computer’s Security Status to display the Windows Security Center window.
If the User Account Control is shown as Off in the Other Security Settings section, click the Turn On Now button.
Log on as a Standard user. When Windows requests your permission to take an action, in the User Account Control dialog box, click an Administrator account, enter the password for that account, and click OK.
There are four types of situations that require authorization: Windows settings that affect the computer system; running a program that’s recognized (digitally signed) but that requires permission to affect the system; running a program that isn’t recognized; and trying to run a program that has been blocked from running by parental controls.