In Windows, the new technology of UAC was introduced from Windows Vista, and UAC (user Account Control, Chinese, which controls users) is a new technology developed by Microsoft to improve system security. It requires the user to provide a confirmation dialog box window that allows the user to validate before executing the action that might affect the operation of the computer or the settings that affect other users. UAC can help prevent malicious software and spyware from being installed on your computer or making changes to your computer without permission.
When UAC is turned on, the user is tantamount to performing general work as a non-administrator, and in the era of WinXP, when Rogue software is rampant, in order for the system to be secure we will usually create a new normal user to log in and use the Superuser Administrator administrator to disable it.
Now UAC is the implementation of this function, and when you need to promote administrator rights to execute the program does not need to switch users, in the pop-up notification window to confirm it.
For example, when we open the registry, the UAC notification window pops up, and the "yes" must be clicked by the user to allow Registry Editor to open.
For a novice unfamiliar with the computer, regardless of the implementation of the program is safe or unsafe, may not be clear, directly in the notification window to determine the point.
For a common user, the usual behavior is the Internet, movies, the system has a problem with a key restore. So, if you think UAC is annoying, you can turn UAC off, see how to turn off UAC.