Adminpak on Windows Vista
Been using Vista for sometime now, but on my other notebook it's just lately that I decided to upgrade my work-notebook from XP to Vista Enterprise, one of my difficulties was to run ADCU on it. Although there are a lot of work arounds available on the net there's always one that will work for you. I got mine on Brian W. McCann's blog [ link here ]
After installing WS03 AdminPack SP1 I've launched CMD run as administrator and started to register all the dll's listed on Brain's blog.

went to Administrative Tools and run ADUC as administrator.... and it worked!