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Two separate questions.
You can get Rivatuner to start without triggering UAC by following the directions here: http://forums.guru3d.com/showthread.php?t=226624
Disabling UAC has been likened to "The Devil's Work:" http://www.hardforum.com/showthread.php?t=1170936 I'm not quite sure I would go that far, I figure it's your system do what you want. Once you learn how UAC works, it drops to be far far less of an issue than when you first set up your system.
Anyway, if you really want to kill it rather than learn how your system works, the driections are in your other thread.
What is UAC? If I turn it off would it give me no Virus and spyware protection at all?