I use Norton Syetem works 2003, in conjunction with adaware and microsoft Antispyware. I have BT broadband so I know bt checks the emails sent to me, but also have a firewall built into the ADSL connection, running through Netgear Firewall FR318. I also have a Firewall built into the PC, but have that switched off. You cannot be sure enough on a net work. This seems to sort things out for me.