Re: User Account Control..
Try changing the local security policy on Windows 7 to activate secure desktop and raise the level of UAC. You'll see this raises the prompting almost to Vista levels, and requires entering a password instead of simply clicking - just as it should be under any secure OS.
It's true that Vista did have a few un-necessary prompts, but mostly it was due to poorly written software.
Once properly written software is installed and normal installation admin tasks completed, it's unusual to see the UAC in Vista.