You can disable netbios 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.
For a visual, see this link:
http://www.med.stanford.edu/irt/secu...e-netbios.html
BTW, Welcome to TechIMO!!!

Mike