Check your settings in Microsoft Internet Explorer:
Launch Microsoft Internet Explorer.
From the Tools menu, choose Internet Options.
Click the Advanced tab.
Scroll to Microsoft VM. Note: If you do not see Microsoft VM listed in the Advanced tab, please visit the Microsoft Java Virtual Machine Support Web site for alternative Java solutions.
Make sure that JIT Compiler is the ONLY option checked.
Look for Java (SUN) and, if you see it, make sure it is not checked.