Originally Posted by LydianKnight
Nah, that's silly... UAC is like going to a cafeteria and asking for a coffee. Then, the clerk asks you 'are you sure you want a coffee?' (Smart answer: No, now I come to think about it, I think I'll go f'ck your sister so... Hey... thanks for the hint!
Now seriously, unless you're downloading unknown programs and you're thinking on deliberately running them, it's perfectly safe to turn UAC off, good for newcomers, but a pest for the rest xD
QFT. It's almost like using the sudo command on linux. Yes I'm well aware that I can crash my box if run a command I'm not supposed to. Yet everything you need to do requires administrator or root rights.
The normal user doesn't need these permissions most of the time, so it is mainly transparent to them.
I'd leave the UAC on if I could turn it off for a specific user. If I'm logging into an Administrator account that means I want to break stuff, so don't try to stop me.