UAC is for the people that do not want to know whats going on in their machines. I would say also to turn off UAC. But I suppose its how much you know of the goings on in your machinery =)
Then you apparently know nothing about what the UAC is, cus then you would know that it does tell you everything thats going on, just about.
As said before, it is not advised to disable it unless you know more then average about computers.
Then again, my "above average" is being able to purposely install a virus, then remove it with no ill effects.