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UAC stands for User Account Control, and is a new security feature of Windows Vista.


UAC in action:


UAC creates two identities for you when you log in to Vista: the one of a standard user, and another one of an administrator. When you use the computer for the regular tasks (like checking email or editing documents), the standard user identity is used. Only when you attempt to do a system maintenance task (like installing new software, or changing settings that affect other users), then UAC temporarily puts the administrator

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You can also choose to use TweakUAC™ , a free software tool that you can use to quickly turn UAC (User Account Control of Windows Vista) on or off, or to make UAC operate in the quiet mode:







Turn UAC off
This option turns UAC off completely. If this is what you want, select this option, press OK, restart the computer, and you won