When I try to connect to a known good WEB page using my Comcast Broadband Connection, I get the message "Page cannot be displayed".  This happens to both of my computers connected to the Broadband connection.. HOWEVER, when I turn off the broadband and use NetZero Dialup on the same computer, I connect to the web page with no problem.  Any ideas what is happening?.  Comcast has assured me that they don't block Web Sites, and the same anti-virus / Firewall program lets me thru on dialup but not broadband.... I am using Windows XP / Norton Internet Security / Ad-Aware..  Any thoughts would be appreciated before I just give up on this one WEB site since all others are working without problems...