NT Folder Security Settings - HELP! PLZ!

Ok guys and gals.. having a small problem here.

Im making a program which will use a secured folder under NT/2000/XP. Now i have managed to get the program to edit the access rights (or at lease some of the access rights) of a specified user. What i need to do is to go through all the usernames that have access to the folder (Administrators, OWNER, SYSTEM, Users etc) and delete all but XXXXXXX User. I cannot figure out how you delete a user from the folder access list.

Also does anyone know how i can setup a folder to inherit the access rights from higher folders through VB code?

Please please please someone help me out with this one. I keep breaking my desk from banging my head on it. Its becoming expensive. ;)

Regards,

Tokhra