Windows Vista のUser Acount Protection（UAP）機能

The bad news, then, is that UAP is a sad, sad joke. It’s the most annoying feature that Microsoft has ever added to any software product, and yes, that includes that ridiculous Clippy character from older Office versions. The problem with UAP is that it throws up an unbelievable number of warning dialogs for even the simplest of tasks. That these dialogs pop up repeatedly for the same action would be comical if it weren’t so amazingly frustrating. It would be hilarious if it weren’t going to affect hundreds of millions of people in a few short months. It is, in fact, almost criminal in its insidiousness.

と非常に使いづらい、と書いてあります。

このUAPと言う機能、MacOSXやLinuxユーザなら知っている管理者権限の必要な操作を行う場合にクレデンシャル（管理者ユーザのパスワード）を聞く機能です。個人的にはVistaには非常に期待しているのでこんな部分で使い物にならないようにされては困ります…