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UAC UAC, which might seem like an annoyance, is actually one of the most important security features of Windows Vista. It is a powerful component of Windows Security System (WSC) that lets you exert better control over the continued well-being of your system. The UAC is a dialog box that continually pops up and asks you for your permission (or password depending on your user account setting) whenever you try to adjust a setting or install a program. The idea is that viruses cannot make changes to your system without you getting to know about it. The UAC is modeled on similar features found in Mac OS X and UNIX. It ensures that your system is safer, even though you may feel irritation at having to give permission or type in your password every time.