Perhaps it is time to make a sticky about how to disable UAC in Vista and why it is recommended
User Account Control or UAC is a new feature in Vista that asks for permission to do system software tasks and also run programs. Unfortunately, this security feature is also annoying. I cannot predict the future of your system or what kind of security vulnerabilities will be used to attack systems, and as such, you need to decide for yourself if you desire to keep UAC active, but if you wish to disable it, here is how I do it:
With the default Category Control Panel:
Head to Start
Select Control Panel
Select System and Maintenance
Select Administrative Tools
Select the System Configuration button
Select the Continue button (if UAC is active)
Select the Tools Tab
Select "Disable UAC"
Select the Launch button
Select the Ok button to close the panel
You will have to reboot for the setting to take effect.
http://www.blackviper.com/WinVista/supertweaks.htm