Go to Start>Control Panel>Add Remove Programs. Uninstall all versions of Java Then go to the link below and get Java Runtime Environment (JRE) 6 Release Candidate use the offline installer and install Java and see if that clears the problem up. I see you are running XP SP1 that could be your problem you may want to try an older version of Java. The can be found at the second link.

http://java.sun.com/javase/downloads/ea.jsp

http://java.sun.com/j2se/1.4.2/download.html

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A little common sense goes a long way

Later Grandpa