What diagnostic is saying this is a firewall problem? This seems like it could be as simple as you having set a proxy server or even there being some minor issue with your TCP/IP configuration. Seems a bit of a leap, at least with the info given, to say it's a firewall issue, but maybe if you told us what it is you did to make that diagnosis, it would change things.
My internet is not working. When I click on the internet browser the messege is "Internet Explorer cannot display webpage" It diagnosis a firewall problem. i had CNET running on my computer and I do believe that it is causing the problem and blocking my computer from connecting to the internet. It is disabling the HTTP and HTTPS and FTP. Any help with this would be much appreciated. Don't know operating system. Model number - PSAA8U-0FH02k. It's a Toshiba Satellite A 105 - S4284, and I use Windows XP.