A lot of risk is involved in turing it off. UAC prevents applications from
altering protected system folders, part of the protection mechanism
employed in Vista. Programs in Vista should be virtualized and run within
the user environment and not the system environment as it was with previous
versions of Windows. Older software often does not comply with
virtualization, causing the prompt for you to allow it to run. Disabling
UAC will allow any program to alter a system folder or file without the
consent of the user, including malware. Utilities like Erunt, by their very
nature, manipulate system folders and will always require elevated
privileges to run properly.