How to make reverse proxy and a check page?

How do I fix: Web page is not available (GoogleChrome) & Unable to connect? (MozillaFirefox)?

• My Google Chrome, Mozilla Firefox, Safari, NetBrower do not respond, only my Internet Explorer. When I type (on Chrome) any web site onto the navigation bar I get: This web page is not available. The web page at http://google.com/ might be temporarily down or it may have moved permanently to a new web address. Error 102 (net::ERR_CONNECTION_REFUSED): Unknown error. And when I type (on Mozilla) any website onto the navigation bar I get: Unable to connect Firefox can't establish a connection to the server at en-us.start3.mozilla.com. * The site could be temporarily unavailable or too busy. Try again in a few moments. * If you are unable to load any pages, check your computer's network connection. * If your computer or network is protected by a firewall or proxy, make sure that Firefox is permitted to access the Web. I have checked my firewall settings, but everything is marked as it should be (I even turned off my firewall and it still doesn't work) I uninstall ed the browsers and installed them again and still nothing. I think it might be my proxy settings, because I downloaded the Google Updater to verify if I had any malware or any other soft wares that might be blocking the internet use of my browers, but it doesn't even start verifying because it says that the internet isn't connected well that there is a problem with my proxy settings. That's why I think it might be my proxy settings but I don't know where to go in order to fix that. If anyone knows why this happened, if it happened to you and you were able to fix it, if you know what to do in order to fix it may you PLEASE let me know?

• Answer:

  try uninstall/reinstall and see if that fixes it, sounds like a corrupt file.