Elmar ,
schau doch mal hier vorbei :
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WORKAROUND
This particular problem is currently under investigation. The workaround for this problem is:
* Check to see if the Java Runtime Environment (JRE) is installed correctly on your system. If you are able to run the testvm applet, then the JRE is installed and configured correctly on your system. The problem may be specific to that particular applet. The applet may contain programming errors or the website is having technical difficulties. In that case, please contact the web site administrators or the software vendor to notify them of this issue.
Test Java Virtual Machine
* Download and install the latest version of the JRE. The latest version may contain update or fixes to your problem.
Install the latest version of Java Runtime Environment Installation instructions