Sharing & Security issues in external hard disk - windows server 2003

Dear All,

I have some issues with the sharing & security issues of folders/external drive in windows server 2003.                                                                                                                                             

We need to plug in an external hard drive with the windows server 2003 and share the drive in the network so that other users mapped to the network can access the folders and files.

After sharing the external hard drive to the network. Then I need to provide user access permission like read/write/modify etc. so when I try to add new user and provide permissions then click apply the window is not responding.

After Step:4 from the picture..

Once click apply then the window become not responding. But still can access my inbuilt hard disk and do all operations. Only problem is I am not able to add user and give permissions.

please help me how can i solve this issues

Regards,

Arun