Your Firewall should stealth all your ports when scanned remotely (with the possible exception of 80)



Disabling Services

Disabling NetBIOS
http://support.microsoft.com/default...EN-US;q137368&
http://support.microsoft.com/default...EN-US;q313314&
http://www.jsifaq.com/SUBL/tip5500/rh5558.htm