In my searches I found one program that could possibly do this - but it was hosted at a known spyware site. Not a good thing!
To locate the appropriate keys in the registry (if they exist), you can use a registry comparison tool. Then set the tool to running, make the change, and then check the tool to see what keys have been changed. In Vista there's a lot of stuff going on in the background, so you'd have to make use of filters in the registry comparison tool to eliminate some of the unrelated stuff.
Once you've found the appropriate keys, then it becomes a matter of trial and error. You're messing around in some of the essential portions of the registry here, so I'd strongly suggest that you backup your registry and make a system restore point before making any changes. It wouldn't hurt to research the methods of restoring the registry when Windows won't load also - it'll save a lot of headaches later on.
If those keys don't exist, then it's likely that those things are coded into one of the system files (most likely explorer.exe). If that's the case, then you'll have to figure out how to "hack" explorer.exe to make it show what you want. I have no idea about how to do this, but suspect it's similar to the "hack" to rename the Start button that was popular for Windows XP.