Disable unused tcpip6 Devices and NETBT
NetBT driver is NetBIOS. The TCP/IP NetBIOS Helper service depends on it. When you disable the NetBT driver, there will be no NetBIOS functionality whatsoever. If this is a standalone machine, this is what you want.
When disabling features, I like to disable their components too. So even though IPv6 is disabled above, I still disable the Wan Miniport IPv6 driver, Teredo driver, ISATAP driver and IPv6 ARP driver.
Control Panel / Device Manager, View menu / Show Hidden Devices
/Network, disable Wan Miniport IPv6
/Network, disable Microsoft ISATAP adapter (IPv6 tunnel)
/Network, disable Teredo Tunneling Pseudo Interface (IPv6 tunnel)
/Non-Plug and Play Drivers /Remote Access IPv6 ARP Driver > Properties > Driver tab >: Change Startup Type from System to Disable
/Non-Plug and Play Drivers / NETBT > Properties > Driver tab > Stop it and change Type from 'System' to 'Disabled'. (disables NETBIOS totally. partially closes port 445)
Reboot.
(To close port 445, one needs to additionally disable the Server service, see Services section below )