The 20 Worst Windows Features of All Time

Nobody can argue that the idea behind UAC is crummy: If the computer is about to do something that's potentially risky, it makes sense to verify that the PC's user wants it to happen. UAC in practice, however, is incredibly clunky, from the alarming screen blackout to the often cryptic dialog box asking for permission to the way UAC gets in the way of humble tasks that ren't particularly riky. We hope that Vista gets a more polished UAC someday--this version is so annoying it's tempting to just disable it and take your chances with attackers.