In Windows Vista, Microsoft introduced User Account Control (UAC), which is designed to mitigate the impact of malware by locking down the desktop (the Secure Desktop feature) and displaying a notification dialog box that warns you of a possible unauthorized operation and prompts you to confirm or deny the operation.
This system will prevent unauthorized applications from automatically installing as well as prevent users from inadvertently making detrimental changes to system settings.
In Vista, UAC is very strictly controlled — you either have it on and in full-force protection mode or you disable it completely and fend for yourself; there is no middle ground. This extreme level of security is often mentioned as a big source of users’ extreme dislike of Vista.
In order to improve UAC’s image while still providing this type of security, Microsoft has modified UAC in Windows 7 Beta to give more control to the user when deciding how UAC works. In this Windows Vista Report, I’ll take a closer look at the new UAC features shown in Windows 7 Beta.
More user options with User Account Control in Windows 7 Beta