TweetFrom what you've described, something is stopping certain pages from loading and the "Page cannot be displayed" is what the browser tells you if the connection attempt times out. In other words, when your browser tries to connect to a server, it gives the server at the other end a certain amount of time to answer, and if the browser doesn't detect the answer after a certain amount of time, whether it's the server not answering or something in between blocking the server's answer (sometimes firewall software can do this), it gives the "Page cannot be displayed" error message.