The easiest and simplest way of getting rid of these certificate error are to disable them though you may see it for the first time but not repetitively.
Steps to solve Certificate Error in Internet Explorer 8 & 9 in Windows 7
1.Just go to your internet explorer option and then go to advance tab as shown below.
2. Now just uncheck the publisher certificate option as shown below and restart your system.
This must solve your problem for any other query please leave comment.