I suggest checking your JavaScript settings in your browsers - this is the sort of display that I would expect with JavaScript disabled.
Enabling and disabling JavaScript in Web browsers
I can't honestly say that I have seen JavaScript disabled across multiple browsers, however I guess it is conceivable that some security software - such as Norton's - turned it off across the board when finding a "Javascript exe" or similar threat.
This is still a long short, very strange behaviour...buy a lotto ticket, your luck may be about to change!