User Account Control (UAC) is a feature in Windows that can help prevent unauthorized changes to your computer. UAC does this by asking you for permission or an administrator password before performing actions that could potentially affect your computer’s operation or that change settings that affect other users. When you see a UAC message, read it carefully, and then make sure the name of the action or program that’s about to start is one that you intended to start.
By verifying these actions before they start, UAC can help prevent malicious software (malware) and spyware from installing or making changes to your computer without permission.
User Account Control (UAC) can help you prevent unauthorized changes to your computer. It works by prompting you for permission when a task requires administrative rights, such as installing software or changing settings that affect other users.
We don’t recommend turning User Account Control off. If you do turn it off, you should turn it back on as soon as possible.
Procedure to follow
Click the Start button , click on Control Panel
clicking User Accounts and Family Safety (or clicking User Accounts, if you are connected to a network domain)
Click on User Accounts.
Click Turn User Account Control on or off. If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Select the Use User Account Control (UAC) to help protect your computer check box to turn on UAC, or clear the check box to turn off UAC, and then click OK.