Well, I accepted a certificate that added links to my favorites and desktop. I can fix that. The problem is that this site also replaced the friendly "This page can not be displayed" error message. The IE default message comes up, but then goes away and what's left is a search engine page from the leech site that sent the certificate.
I already tried reverting back to IE 5.5, but that didn't help. There's got to be a page somewhere that I can replace.