I don't think that's possible in Windows XP, but I'm not 100% sure either. I will look more on this.
You may use the parental control
feature to give other users less access, but editing the registry for your cause
is beyond me.
I have not used this method, but you may want to have a look here:http://en.kioskea.net/forum/affich-45891-how-to-restrict-access-to-a-folder
The DOS method should work (be very careful here), but it would still rely on user access.
There are some programs that will claim to do what you have asked, but I do not recommend them.
Either way, I don't think this will answer your question, but I hope this helps!
Edited by bloopie reborn, 18 July 2011 - 07:40 PM.