Disable User Account Control (UAC) the Easy Way on Windows Vista :: the How-To Geek.
That’s right. Kill UAC. things like slow network performance, the annoying popups and other arcane bugs go away. Now if you do not run your computer properly then this leads to a less secure system. If you run your system according to my podcast episode this is a safe measure.
*UODATE* With Windows 7 out there’s really no need to kill UAC. I had it running on my laptop for a while and really did not notice it until it popped up for something legitimate. Turning off UAC for windows 7 is optional..:)