Yes, hence why the annoying registration popup keeps coming up when they go there. That might be the reason why your post count on the forum isn't as high as you expect it to be,
Oh god, get rid of the fake IE security bar also (especially given I'm using Firefox). Don't nag your users into registering. Give them positive incentives, don't punish them. If your site offers unique content with a helpful atmosphere, users will register naturally. If you have nothing to offer, then they won't join. Nagging them won't help (opposite effect).