And I hate to contradict *you* - but I haven't done that and I too have a lock on the Doc an Settings folder - b/v that is not a real folder it is a virtual folder established for compatibility with older programs designed for XP, thus it allows the system to redirect the application to where it needs to go to.
In point of fact, if you check the ownership, even if you take ownership and add your permissions, they are over ridden b/c the System ownership has special permissions which you are not in effect changing , and the virtual folder and its tree are inheriting from that first and foremost.
Remember, I have not done anything like you are describing regarding having ripped out all other users - every thing in this install is as it was when I finished installing 2 days ago.