Setting this field seems to work about 10% of the time. I've removed & reinstalled steady state, removed my user, imported users, etc, but to no avail. The only non-Microsoft service that is running is Norton Internet Security 2009 - Startup items are pared down to the bare minimum. I've heard that sometimes it takes 15-20 minutes to do the restart but have never let my computers go that long.
I'm on brand new Dell Studio Hybrid computers -- 2.0GHz dual cores with 3GB RAM, running Vista fully-updated to SP2.