When i do a Google search the fallowing message come up what setting might have got changed?

The connection has timed out

              

The server at www.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.