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Windows Vista includes a new feature called User Account Control, or UAC, as we ll call it from now on UAC is a feature that is designed to help reduce the possibility of spyware or malware installing on or making configuration changes to your computer Since UAC is a new feature in Windows Vista, you can certainly expect an exam question or two Be sure that you know this section well before taking the test!
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Using UAC
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UAC is a user account specific setting; by default, the UAC is turned on whenever you create a new account If you open User Accounts in Control Panel, select an account, and then click Turn User Account Control on or off, you see a simple window where UAC is enabled along with a recommendation to leave UAC turned on, as you can see in Figure 3-1 So, there s not much to UAC in terms of initial configuration it is already turned on by default But the bigger question is, what does UAC actually do UAC is designed
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to prevent unauthorized changes to your computer Essentially, the entire feature is designed to help prevent malware or spyware from changing or installing anything on your computer because installation or configuration changes require a UAC prompt and an OK from the user in order to continue The User Account Control dialog box tells you that Windows needs your permission to continue, and it tells you what action is being taken so that you can continue or cancel the operation The idea is that if malware or spyware tries to silently install anything on your PC, you ll get a notification allowing you to cancel the action before it takes place By default, all accounts on Windows Vista, beyond the initial administrator account, are standard accounts with restrictions Rather than getting an access denied message when you try to do something beyond the standard account s privileges, you get a UAC dialog box If you are logged on as a standard user, you must provide an administrator password If you are logged on as an administrator, you get to simply see a permission dialog box where you need only click Continue The UAC dialog box sits on top of what is called a secure desktop, meaning that no bogus dialog boxes from malware can get in front of it and redirect you
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3: Manage Post-Installation Issues
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INSIDE THE EXAM
UAC Alerts
UAC provides several different alerts, depending on what is happening with your system Yet, you may have noticed only one or two, so for the exam, you should at least be familiar with all of the possible alerts you may receive from UAC You may see UAC alerts used in a variety of scenario-based questions on the exam, so you should review the kinds of alerts that are possible, as explained in the following list:
part of Windows needs your permission to start This program has a valid digital signature that verifies its name and publisher, so both you and Windows know the program is what it claims to be Once again, this can be annoyance because you ll need to click Continue in order for the program to run
Permission to continue This alert is a security alert that tells you that something is accessing a function or program that can affect other users on the computer Typically, that something is you, so the permission to continue UAC alerts is the primary annoyance because it pops up for all kinds of things, even opening many Control Panel applets Nevertheless, it is a good security feature Program needs permission This alert appears when a program that is not a
Unidentified program needs permission This alert is where UAC really pays off because you ll get the alert when any program without a valid digital signature tries to start The fact that the program doesn t have a digital signature doesn t mean there is a problem, necessarily, but it does mean you should pause and make sure the program is one you installed and you know where it came from Blocked program This alert simply tells you that a program has been blocked In order to run the program, you ll need to log on with an administrator account
The secure desktop ensures that only UAC dialog boxes can run in that space and you are seeing a real Windows prompt That s good, but the constant interruption by UAC is certainly a trade-off between security and annoyance Any configuration button you see on Windows
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