antispyware then why do you need UAC. Even regular users like myself dont need it. Hayu: you really should have let people know which version of Vista you're using; only Vista Enterprise and Ultimate can change specific settings for UAC. All other versions of Vista can only turn it completely on and completely off. As a security professional I think UAC is a great tool, for the common "User". that being said, it is annoying to power users and system admins. And even for some business users. For example we have an app that all our employees use, that is run 10 to 30 times a day on each computer. This application triggers UAC prompts because it tries to directly access the hard drive. So the users get so used to just clicking continue that it loses all effectiveness. Now the real kicker, if you leave UAC off, you will run into issues if you try to install a printer. Why? I have not clue, or a better question is why would changing DPI for a user require Admin permissions? UAC, while a great concept was not fully thought out before implementation. In response to IT Guy's April 4th comment, I'd say that releasing Vista in its present form, when MS was undoubtably aware it would break many legacy apps, was the concept that was not fully thought out, period. I think all posters have a valid point. I think as most do, that the UAC is a very valid