I've got a couple problems with some websites not working but others do work:
IE can't go to microsoft.com but it can for example go to bleepingcomputer.com. When trying to go to microsoft.com it says "Internet Explorer cannot display the webpage". But bing.com does work.
Meanwhile Firefox can't go to google.com, or microsoft.com either. It says they use an invalid security certificate. But IE can go to google.com.
Also, on IE, the news pages on bleepingcomputer.com don't load the css stylesheets (but they do on the forum), and on Firefox the stylesheets don't load on mozilla.org. Sites like majorgeeks will work somewhat but then when I get through to some download links they get the cannot display the webpage error.