Windows 2000 and DHCP

I am installing a W2K server that will be used as a exchange server. This is my first time with W2K. I have DHCP installed. When a client connects, it can see the server and access files etc. The server sees the client in network neighborhood but cannot find a path to look at the client’s hard drive. All works fine if I go back to static addresses. Runs the same with or without AD. I need the DHCP working.