csmager said:It is more secure. If you want to stop it irritating you, but not turn it off completely, you can modify the registry to auto-accept all prompts. This means that most processes are still running as non-admin, and IE still runs in protected mode.
http://brandonlive.com/2007/02/06/more-secure-way-to-disable-uac-without-losing-protected-mode-ie/