Internet Explorer 7 is saying "Certificate error: navigation blocked". This means that, although the secure server certificate is encrypting data correctly, IE7 cannot verify the domain name. That is because there is not a SSL certificate for your particular domain name.
This does not indicate a problem with the website or control panel. This could be more acurately described as a fault with Internet Explorer being a little overly paranoid on your behalf.
Your choice is to either click that you want to navigate the site anyhow, or permanently disable the warning.
If you would like to permanently disable the warning error, go to the Internet Explorer Tools menu and select Internet Options, Advanced tab. Scroll down to the bottom (under Security) and disable/uncheck "Warn about certificate address mismatch".