I am on Windows 7 and using Firefox browser. I am using WiFi, but since the morning I cannot access the Internet via the browsers (Firefox, Chrome, or IE). The laptop shows there is Internet connection, Skype is online, but I can't reach the Internet. Then I launched Tor application which creates secure channel and provides its Firefox browser. Well, I can now access the Internet over that browser. So, what might be the problem causing this malfunction?

The error:

      The connection has timed out                 

      The server at mail.google.com is taking too long to respond.     

  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.

Best regards