Another thing you might try is the following:

Load a browser and click on Tools -> Internet Options. When the window pops up, clean out your Temporary Internet Files by clicking on the Delete Files button and then OK. When its finished, close all of your browsers and re-load.

If this does not fix the issue, you will want to update your Java Virtual Machine Software. Head to www.microsoft.com/javavm or www.sun.com to get a newer version as yours may have become corrupt for some reason.

Hope this helps.