Website Security Certificate Error:  Security zones to default. If you configure security settings to be too restrictive, you may prevent Internet Explorer from displaying certain Web sites. To determine whether an issue is caused by overly restrictive security settings, revert to default security settings. To do this, just follow these 5 steps:
Option A:
01. Open Internet Explorer.
02. Click Tools, and then click Internet Options.
03. Click the Security tab.
05. Click reset all zones to default level, and then click OK.
After you do this, test Internet Explorer to verify that it works correctly, if answer is NO, go for B.
Option B:
Also try the following steps:
1. Open an Internet Explorer window. Click “Tools,” then choose “Internet Options.” This will open the Internet Options window.
2. Click the “Content” tab in the Internet Options window. This will open the Content options page.
3. Click the “Certificates” button on the Content options page. This will open the Certificates window.
4. Click the “Untrusted Publishers” tab in the Certificates window. It may be necessary to scroll horizontally to see the tab.
5. Click to highlight the security certificate that you want to trust, then click the “Remove” button.
This will open a confirmation window.

Click the “Yes” button in the confirmation window to complete the process.

About certificate errors link:

software config:  •Windows 7 Ultimate 32 OR 64-bit  •IE9 Beta, Version 9.0.7930.16406

I hope this information help you.