Access right on folder

Hi:
I'm new to this asp and I encounter some problems and need your help.
1) How to granted access to different users base on NT account?
2)I have remove the anomomous from the IIS and also in the setting of the folder( security is given to read and list only) BTW I 'm using virtual drive from the IIS. But I 'm still able to delete and create folder which I should not have.
3) Can you kindly explain other than the IIS and the folder access place that I should mofified, what other place should I change to affect the permission of the folder accordling to the NT account?
Thanks

You must change the permissions on the "Security" tab for the share that the virtual directory points to, or if it is not a share you must still change permissions on the "security" tab in Windows. Select the folder that the virtual directory points to, Right-Click then select "Properties". From there you will see the "Security" tab. Also in IIS make sure that you have it setup so that you are not logging in to the share (if applies) or using an Administrative account. Administrators by default have "God" access.