What is the site with the faulty hyperlinks?
Just out of curiosity, is it http://meex.x10hosting.com/?
Because the only link on that page is the link to the login page. Which has an error in it. Not quite sure how to fix that, I know pretty much nothing about IIS and ASP[.net].
But the fact is that the page with the error is coming up after I click the hyperlink.
I'm guessing the problem here is a scripting problem on your Login.aspx page rather than an issue with hyperlinks.