Thanks, I fixed it, the problem was related to hosts file. After removing it and downloading it from here http://www.thewindowsclub.com/how-to-set-the-windows-7-hosts-file-back-to-default , and changing the permissions for the users to full control it started working again.
I got it from Microsoft after removing it as I tried changing the permissions but they were already fine with full control, after that it started working.
I did the steps on that link you provided each by each but it was not fixed.
Replacing the hosts file by downloading it did the job.