Hi trillien,
You may want to try clearing your cache via the following process and perhaps that will resolve your problem:
In Internet Explorer go to the Tools menu, click the Internet Options menu item, then click the "Delete Files" and "Delete Cookies" buttons.
In Firefox, go to Tools -> Clear Private Data -> Check Cache and Cookies -> Clear Private Data Now.
Remember to close all browser windows but one while clearing your cache.
Also, make sure the site you are trying to sign up at is http://www.auctiva.com
-Mike