[Blade110L]

Hi There,
I've browsed countless websites for hours trying to find a solution to my problem with internet explorer 7. A few days ago internet explorer stop running altogether on our desktop PC and displays the error "this website cannot be displayed". On this computer Safari is also downloaded and it has the exact same problem displaying a similar error message. The ISP is bell and the connection isn't the problem as msn messenger and wireless computers are running fine. I have tried downloading current windows updates and security features but nothing has started IE7 up again. I was wondering if you know why this is happening and any solutions to this problem. We also run Norton Antivirus on this computer but it isn't working right now either. Please help in anyway possible. Thank you.