These are my suggestions:
1. Open Internet Explorer, click on Tools menu on the top bar, select Internet Options, Advanced tab, scroll down to JIT compiler for virtual machine enabled. Ensure this ticked - If it isn't, click a tick in the box, and then reboot your machine. Try again on the site.
2: Install/Reinstall Microsoft Virtual machine; this can be downloaded here for all versions of Windows
I have Zone alarm pro, and in the settings, Privacy, Mobile Code, there are 2 boxes referring to Java. If you have Zone Alarm, ensure they are not ticked.
Maybe other Firewall programmes have similar settings. If you have a Firewall, check this.