Re: Certificate Error: Navigation Blocked
try the below steps or use other browser like mozilla firefox, chrome
Launch IE7 by double-clicking the IE7 icon on your desktop.
Open the Internet Options application window. Click the "Tools" icon in the top menu bar (it contains the word "Tools" next to an image of a gear). Highlight and click on "Internet Options."
Open the "Advanced" detail panel in the Internet Options application window by clicking the "Advanced" tab in the top menu bar of Internet Options.
Scroll down until you locate the "Security" settings.
Turn off certificate checking. Use your cursor to uncheck the box next to "Warn about certificate address mismatch."
Click "Apply" to save your settings. Click "OK" to exit. Restart IE7 for your changes to take effect.