It certainly does make sense....
And - as it is happening on other sites for you too....
OK... If you are willing, let's try this... As you are running IE 8...
- Open Internet Explorer - and CLICK ON THIS LINK: http://windowsupdate.microsoft.com
- Next select CUSTOM and scan
- If a Root Certificates update is listed (possibly in the Optional Software updates category on the left-hand side of the scan results window), install it...
As well - it *could be* that you have some other AV program on your computer, which is still held in your browser sessions - BUT - we'll get to that in a while, OK??
Best to you!
John