Its appearing on every single page over and over and again. After the 100th time viewing it, I'm officially sick of looking at this advertisement.
Edit: The problem is now fixed. It turns out it was a cookies problem after all. Apparently someone who lives in my house reset my cookies settings.
Anyway, if you are using firefox, go to Tools, Options, Privacy, Cookies, and then change Keep Until: to "they expire." This should fix the problem.