I have routers, norton, etc but the writers of malware keep coming up with new ways to attack.
As this article demostrates, you really should go to the tutorial link, I posted at #58.
Tracking cookies are another whole issue, am using Karen's Cookie Viewer for seeing what has been accumulated and removing some of the cookies.
I just switched from Norton to VCOM's System Suite for Trend's antivirus and a firewall much like Zone Alarm, guards both incoming and outgoing!
See this one
Get the traffic you need,
get customers to come to your web-site.!!!!