Folder permission

Currently i am handling two listed company network admin different is co. A and B.
A job assign to me by my manager is to shift all client workstation file to data server.

In Co. A, i successfully shift all client file and folder to this server with security and permission but Co. B, i failed to do that cause the server wont allow me to create or paste file to the server filder.

Both company using seperated server and Co. A is running Win2k server and Co. B is Win server 2003

Why? both setting is the same. Create user group and assign folder permission accordingly.
Even server administrator also cannot create folder from server site.

I only manage to create folder using the server itself.
Pls help meeee.....