I have your solution and I registered to this forum just to reply to this post. It is a windows update that changes how encryption works with Internet Explorer. The Windows update is KB2661254. If you uninstall it, it will fix your problem.
Update for Windows 7 (KB2661254)
Download size: 1.5 MB
You may need to restart your computer for this update to take effect.
Update type: Important
Install this update to keep your system up to date by increasing the minimum level of encryption on Windows systems. After you install this item, you may have to restart your system.
More information:
http://go.microsoft.com/fwlink/?LinkId=260798
http://go.microsoft.com/fwlink/?LinkId=260798