Sharing :: Mapping Network Drive Windows XP

At work we have a private network set up so that any computer that is plugged into the wall is on the same network. (i.e. all ip addresses are identical except for the last block of numbers)All machines are running WinXP.We have one computer set up as a file server (computer with shared folders) that is plugged into a wall socket. We have 3 other machines that can see and access the shared folder on the server computer once they are plugged into a wall socket. The odd thing is that these 3 machines have different settings as far as I can tell. They are all on different workgroups but they have no problem finding the shared folder.However, when I go to plug my laptop into a wall socket, I am not able to map a network drive. The error msg says it cannot find the drive. I have my laptop set-up on the same workgroup as the server computer and the server computer can see my laptop. But when I double click on my laptop in the server computer workgroup I get a msg saying permission is denied.

My laptop can connect to the internet, but cannot find the shared drive. I have tried turning off my laptop firewall, the server firewall, both firewalls etc with no success. In my Local Area Connections I have the following all enabled "Client for Microsoft Networks", "File and Printer Sharing for Microsoft Networks", "QoS Packet Scheduler", "Internet Protocol (TCP/IP)".