I've tried that as well as clicking "ok" to the error and then going back to the previous page. Nothing seems to fix the root problem. What's really weird is that I can type www.united.com initially. The issue doesn't start until once I'm already past that and on another page.

It seems to work fine on my work laptop, which still has IE6, not IE7 like my personal laptop. So, it may be an IE7...or most likely a Windows update that's causing this.

Oh well...