One question before proceeding, is this a stand alone server(Workgroup) or is it actually part of a domain. the process for connecting the two are slightly different. If it's in a workgroup only and not a domain, go to network properties and make sure the workgroup name is located in the workgroup section of the "Identification" tab. Once you restart, you can do a seach, for computer, type the computer name and click on search. It should then give you a listing of the computer name and which workgroup it is in. You can then drill down on that entry, right click on the volume you wish to attach to and map a drive letter to it.
If the server is actually in a domain, there are a few more steps. First make sure the Client for Microsoft Networks is installed. Once installed, go to network properties, select the "Client for Microsoft Networks" and then click on properties. Make sure the "Login to Windows NT Domain" is checked and the domain name is entered in the "Windows NT Domain". Click on OK, then on the network properties window, click on OK again. Windows will ask for a restart. Once restarted, the domain will ask for a valid login. Once you are logged in, go to network neighborhood and the server will appear in the list. From there, you may drill down and assign a network drive to one or all of the shared NT volumes.