How to disable NetBIOS over TCP/IP?
In Windows 2000/XP you have the ability to disable NetBIOS over TCP/IP. You do this by right-clicking on My Network Places and selecting Properties. Then right-click on the appropriate Local Area Connection icon, and select Properties. Next, click on Internet Protocol (TCP/IP) and Properties. Now click Advanced, and select the WINS tab. There you can enable or disable NetBIOS over TCP/IP. The changes take effect immediately without rebooting the system.