Please follow this instruction to fix it:
A certificate error message in Internet Explorer is designed to pop up when the browser detects a website’s security certificate contains invalid information. This is done to protect Web surfers from malicious websites that can download viruses or fake websites set up to gather personal information. But sometimes this security feature goes awry and begins to block trusted sites the user knows are safe.Difficulty:Moderate
First, please check your computer date settings is correct!
Method A:
* 1 Close Internet Explorer, then click the “Start” button. Type “regedit” in the search box if you are running Vista or in the run box if you are running older versions of Windows. Hit “Enter.”
* 2 Highlight “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\Main\FeatureControl” by clicking on it.
* 3 Highlight “New” in the edit menu and click “Key.”
* 4 Type “FEATURE_ERROR_PAGE_BYPASS_ZONE_CHECK_FOR_HTTPS_KB954312″ in the new key box and hit “Enter.”
* 5Highlight “New” in the edit menu and choose “DWORD Value.”
* 6Type “iexplore.exe” in the value box and hit “Enter.”
* 7Choose “Modify” in the edit menu and enter “1″ in the modification area. Click “OK.”
* 8Close the registry editor and open Internet Explorer to see if the certificate error problem is fixed.
Other Tips:
1. Computer Date and Time
One reason a security certificate error might pop-up is because the computer date or time might be incorrect. An adjustment to the system time of the computer will remedy that type of certificate error.
2 Expired Certificate
Sometimes the security certificate is actually expired for the website. If this is a website that you frequently visit and the error is new for this site, you might have to wait until the website renews its certificate. Websites have to renew their security certificate every so often.
3 Malicious Site
If this is a new site that you have never visited before, the site might be malicious. It is recommended that you not continue to browse a site without a valid security certificate, and defiantly don’t input any login credentials.
4. Browser:
If you still have problem, please try another well know browser: Firefox
You can get it here: http://www.mozilla.com/en-US/firefox/new/