Seconfig XP 1.1Free
Seconfig XP can configure Windows not to use TCP/IP as transport protocol for NetBIOS, SMB and RPC, thus leaving TCP/UDP ports 135, 137-139 and 445 (the most exploited Windows networking weak point) closed.
This tool works only with Windows registry (it doesn't install any files/drivers etc.).
Seconfig XP can also configure other hidden security related Windows TCP/IP settings and disable some insecure and mostly unneeded services.
For additional safety Seconfig XP backs up every changed setting, allowing user to restore all settings to their original values.