Try a windows offline java download you can do that here:
(you need an account to see links)
Once you have done that find the file and run it as admin
Or you can try this:
1. Uninstall Java (Search and make sure all java is uninstalled)
2. Run an application in Internet Explorer which will prompt you to download a java plug-in. (This way you will install a fresh java that might not error out)
3. Install the Java applet.
Sorry if this didn't help you, i tried @(you need an account to see links)