Cant use internet unless firewall is off

Im having major problems here! I can't seem to connect to the internet unless I have my security or firewall turned off. I don't understand why it is doing this all of a sudden because it was fine until yesterday. I kinda looked around to see if I could figure out what it was but the only thing I found that might be it is in my internet options, in connections, there are no numbers anywhere. Could that mean that the computer isn't connecting because there is no address? But then why would it work when the firewall is off? Im so confused and I know if I keep looking I might screw something up big time. BTW, I just downloaded Norton 2005 with Password manager a week or 2 ago. Do you think that could have anything to do with it? Someone please help!

 

Check to be sure your firewall isn't configured to block all internet traffic.

 

its not the firewall. Its set at medium security and I cant find any signs of it blocking the internet.