First -- if you don't have a third-party firewall installed (eg ZoneAlarm or similar) then you MUST enable the Windows firewall to at least give you some protection from hackers. You have already established that Norton AV is to blame for your email problem, not the firewall, so unless you are using the Norton Personal Firewall, turn the Windows firewall on! As for your email problem, go into the Norton AV options and disable email checking (I know you can do that 'cos I used to use it myself till I ditched it for being to pricey and too resource-hungry). Norton AV will still monitor your downloads for viruses even with the email-checking disabled, and you will still be able to check email attachments for viruses by saving the attachments to a folder and using the right-click menu on the files ('Scan with Norton Antivirus') before opening them.