Can't connect to internet

I had Norton Internet Security on my computer that expired, I put in a NIs 2008 disk that I thought would renew my subscription but the installation didn’t work.  Now my computer will not load any web pages.  I am connected but can’t load any page.  My husbands computer works fine so its not the connection.  My internet connection was fine before I put the NIS 2009 disk in my computer.  Please help!!!