Hello. I have a Toshiba laptop that I changed the windows to 8.1. From that point on, Firefox can't access the Internet. I tried Chrome and IE and the same thing happens. I have the antivirus on and the network connection is working. However, for some reason the web pages don't open up. It would be considered a great achievement if I even reach the Google website. Other than that, no other pages are able to open up.