UAC is the Windows Vista User Account Control. UAC is basically another way to protect the computer from the user, or the user from himself. Much like those 'Do you really want to delete this file ?' questions UAC asks the user to give an application additional privileges even if currently logged on with an account that should have sufficient rights to do so in first place. So, UAC is basically asking the user the question "Do you really want to execute the following application".
Most Windows Vista users get really annoyed after a short while because those UAC popups open many times during a normal session. The only way so far to get rid of UAC was to disable it completely. While this got rid of the UAC popups it does also turn the security feature off completely. Not a big problem for users who know what they can and what they can't do with their system but surely a problem for inexperienced users.
Tweak UAC is a small software that offers a third possibility. With it you can enable the Quiet Mode for UAC which leaves UAC on for all users but suppresses the UAC popups that pop up rather frequently.
This means that the benefits of UAC such as running programs like Internet Explorer in protected mode will still be available while the annoying UAC popups are removed.
Tweak UAC does not need to be installed on your PC. Just run it and select 'Leave UAC operating in the Quiet Mode' when the option appears.
Update: The program, originally designed for Windows Vista, is also fully compatible with the Windows 7 operating system. It is likely that its author will add compatibility for Microsoft's upcoming operating system Windows 8 as well in a future release. Windows 7 on the other hand comes wit built-in options to modify the UAC behavior, so that you do not really need the program anymore for that.
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