Don’t worry about it – it is NOT a virus. It is simply a small exploit in IE that allows a page to be cloaked based on certain conditions. I don’t want to go into details about what exactly the exploit does and why a webmaster would want to use it (all I need is a bunch of affiliate drones using my tricks to compete with me) – but I will say that it’s nothing to worry about and in no way jeopardizes your computers privacy or security.