Problem with Applets in all my browsers

Hi everybody!
I'm going kind of crazy with this, googling up and down the Internet but I haven't found any clue to solve it.
Whenever a try to open a website with an applet in it, it doensn't work. I've tried many different applets from different webpages but I keep getting the same errors.
With a simple "Hello World" applet I get this output in the console:
basic: PluginMain.unregisterApplet: 2 from mananger sun.plugin2.applet.Applet2Manager@104e92a
basic: Listener de progreso agregado: sun.plugin.util.ProgressMonitorAdapter@dfd603
security: Expected Main URL: http://www.cis.upenn.edu/~bcpierce/courses/629/papers/Java-tutorial/getStarted/applet/example/HelloWorld.class
network: No se ha encontrado la entrada de caché [URL: http://www.cis.upenn.edu/~bcpierce/courses/629/papers/Java-tutorial/getStarted/applet/example/HelloWorld.class, versión: null]
network: Conectando http://www.cis.upenn.edu/~bcpierce/courses/629/papers/Java-tutorial/getStarted/applet/example/HelloWorld.class con proxy=DIRECT
network: Conectando http://www.cis.upenn.edu:80/ con proxy=DIRECT
network: No se ha encontrado la entrada de caché [URL: http://www.cis.upenn.edu/~bcpierce/courses/629/papers/Java-tutorial/getStarted/applet/example/HelloWorld/class.class, versión: null]
network: Conectando http://www.cis.upenn.edu/~bcpierce/courses/629/papers/Java-tutorial/getStarted/applet/example/HelloWorld/class.class con proxy=DIRECT
network: Conectando http://www.cis.upenn.edu:80/ con proxy=DIRECT
java.lang.ClassNotFoundException: HelloWorld.class
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
basic: cargar: clase HelloWorld.class no encontrada.
java.lang.ClassNotFoundException: HelloWorld.class
    at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager.initAppletAdapter(Unknown Source)
    at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)
basic: Listener de progreso eliminado: sun.plugin.util.ProgressMonitorAdapter@dfd603
security: Restablecer el almacén de certificados de sesión denegados
You can check the applet code here: The Hello World Applet
This happens with Chrome, Firefox and IE.
I've updated the JVM to its latest versions and the same thing keeps happening.
The console output has some messages in Spanish, if you need translation, just let me know.
Thanks!

- bump -

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