Norton Antivirus 2013 not letting me on some sites

I've looked all over for this and I get the same response that does not work. I don't know what the problem is but this comes up when I try to access certain sites, "Add Google Chrome as a permitted program in your firewall's or antivirus software's settings. If it is already a permitted program, try deleting it from the list of permitted programs and adding it again. Error 138 (net::ERR_NETWORK_ACCESS_DENIED): Unable to access the network." It lets me on other sites such as YouTube and Hotmail. The site is 100% safe and I can use it with other computers around my house that have a Norton antivirus program. Is there a solution to this problem at all? Please help me out :smileysad: