This is sometimes caused by a conflict in any add-ons you may have. Try
Start. Click All Programs – Accessories – Systems Tools. Click Internet Explorer (No add-ons).
If this solves the problem you will need to find out which add-on may be causing the problem by a process of elimination.
Sometimes the problem can be solved by:-
Going to: Network And Sharing Center, Next Go To:Internet Options in the left then to Advanced and check Use Software Rendering Instead Of GPU Rendering
Have you tried another browser such as Firefox?