What is UAC?

UAC (User Account Control) is a new technology introduced by Microsoft in Windows Vista to improve system security. It requires users to perform settings that may affect the operation of the computer or perform changes that affect other users. Before the operation, provide permission or administrator & zwnj; password. By verifying these operations before they are launched, UAC can help prevent malware and spyware from being installed on your computer or making changes to your computer without permission.

But it doesn't mean that not turning off UAC will definitely cause the software to be unusable, because it will usually be prompted during the installation process, so the program has been installed, but if you do not close UAC, Some functions related to other functions of the system do not work properly. For example, if you install the player, you must associate the media file format. Make sure that the movie file is automatically played by double-clicking the movie file, but if you open UAC, it may be associated. Failure requires manual operation.

UAC security authentication mechanism

how to turn on and off UAC: http: //www.45it.com/vista/201005/24404.htm different security levels What is the difference: & lt Protecting Win7 security has to say UAC, as we all know, UAC is the abbreviation of User Account Control, its Chinese translation for user account control, is a new technology cited by Microsoft in Windows Vista and Win7, the main function is to carry out some will affect system security When the operation is performed, UAC will be triggered automatically. After the user confirms, most of the malware, Trojan virus, and ad plug-in will be executed when entering the computer. Copy the file to a directory such as Windows or Program Files, install the driver, install ActiveX, etc. And these operations will trigger UAC. In the face of these insecure factors, how can users solve the problems caused by UAC? This article details the detailed functions of the UAC touch and can disable these programs when prompted by UAC. The ability to trigger UAC operations includes: modifying the Windows Update configuration; adding or deleting user accounts; changing the user's account type; changing UAC settings; installing ActiveX; installing or uninstalling programs; installing device drivers; modifying and setting parental controls; Registry; Move or copy files to Program Files or Windows directory; Access to other user directories UAC is annoying. Microsoft has joined UAC since Windows Vista, which has become one of the criticisms of VISTA, because Vista Unlike Win7, UAC can be level-set (in fact, Windows 7 UAC is also annoying), the general configuration of the computer at that time is also very low, so people pop up on this move, but also the guy who locks the screen is very disgusted. UAC is perfect in Win 7 because UAC is too annoying, so Microsoft added UAC's level setting function in Win 7, which corresponds to 4 levels: default level (level 2): ​​under the default level, only in the application The user will be prompted when the program tries to change the computer settings, and the user will not prompt for changes to the Windows settings. At the same time, the secure desktop will be enabled in this mode to prevent system settings from being bypassed by UAC. It can be seen that the default level can not interfere with the normal operation of the user, and can effectively prevent the malicious program from modifying the system settings without the user's knowledge. This level setting can be used by normal users. A slightly lower level than the default level (Level 1): A slightly different from the default level is that the level will not enable the secure desktop, which means that it is possible to bypass the UAC to change the system settings. However, in general, if you want to start some programs and you need to modify the system, you can run it directly without any security problems. However, if the user does not run any program but pops up a prompt window, it may be that the malicious program is trying to modify the system settings, and you should decisively choose to block. This level is for users with a certain system experience. The lowest level (level 0): The lowest level is to turn off the UAC function (must be restarted to take effect). At this level, if you are logged in as an administrator, all operations will run directly without any notification, including modifications made to the system by viruses or Trojans. At this level, viruses or Trojans can connect to other computers on the network or even communicate with computers on the Internet. It can be seen that if UAC is completely turned off and logged in as an administrator, system security will be seriously degraded. In addition, if you log in as a standard user, installing, upgrading, or modifying and setting up the system will be rejected directly without popping up any prompts. Users can only do so with administrator privileges. It can be seen that UAC is completely turned off and logged in as a standard user. Various operations and settings are also very inconvenient, so it is recommended not to select this level. The highest level (level 3): Under the advanced level, “Always notify & rdquo; (that is, fully open), under which the user installs the application, upgrades the software, and the application changes the operating system under any circumstances. If you change the Windows settings, etc., a prompt window will pop up (and the secure desktop is enabled) to request user confirmation. This shows that this level is the safest level, but it is also the most “trouble” level. It is suitable for multiple users sharing a single computer, restricting other standard users, and prohibiting them from changing system settings at will. But UAC is very useful for UAC. Although people who install software often are annoying, the role of UAC is not to be underestimated. I have to admit that Microsoft's concept of operating system is very advanced, so I often come up with some great but embarrassing things, just like VISTA, when people started to accept Windows 7, today, go back to see Vista. It is only becoming more and more aware that VISTA is actually a very good operating system, but it is just a bad time.