Hi,
I have active directory in our office what i want to do is hide folders to user they are not able to access.
I donno how to hide folders that the user cannot access to them.
Please help me thanks.

They don't have to be hidden to restrict access. Assign the proper permissions How do you know when a politician is lying? His mouth is moving.
In other words they can't see folders unless you gave them rights to see them. The first issue is you can't just share anywhere or inherited permissions from above will defeat you from blocking rights below.
Might want to get a MS server book so you can review and clearly understand the concepts needed to assign rights to folders and files on the server.
Answers are only as good as the information you provide.
How to properly post a question:
Sorry no tech support via PM's
Can guys pls explain how to do that i'm new to this stuff.
and thanks for the reply.
As wanderer said, get a good book or take a course. This is very basic server stuff; if you don't understand it, or can't easily find the answer, then you are best advised not to play about with a server system. There are just too many ways that you can mess it up.
