I can't believe no one's chimed in to help you.
Have you fixed it yet? If not, or for anyone else in the future, this sounds like a cookie problem. Enable your cookies and it should work.
If not, use another web browser. Some web browsers don't display these sorts of pictures properly. The result is that it'll show you a picture of the words "all over" when it really wants you to type something else like, "party arcanum."
Outside of those two things, have a friend register for you or use a different computer.