How to prevent users from accessing share folder in windows xp?

I want to prevent users from accessing share folders after typing the IP Address and press Enter it should popup an error message not after the users be able to see all those shared folders and when they click on the shared folder it receive an error message like access denied.

So far I have set NTFS and Share folder permission but doesn't work for the URL bar with IP Address, however it works fine when users click on the shared folder.