Make sure the %ProgramFiles%\Java\jre6\ and %APPDATA%\Sun\Java\jre1.6.0_10\ directories are empty. Are any of the Java files still in use? (Kill jqs.exe in Windows Task Manager) Try rebooting or using ProcessExplorer to find files that are still running out of the jre6 directory.
For Java:
Do I have Java? - http://www.java.com/en/download/installed.jsp?detect=jre&try=1
Test whether Java is working - http://www.java.com/en/download/help/testvm.xml
Java for Windows - Firefox/Mozilla - http://www.java.com/en/download/windows_xpi.jsp?locale=en&host=www.java.com:80
For those who don't know, Java and JavaScript are NOT the same!
How do I enable Java in my web browser?:
http://www.java.com/en/download/help/enable_browser.xml
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How do I enable JavaScript in my browser? (Covers all browsers):
https://www.google.com/adsense/support/bin/answer.py?hl=en&answer=12654
Ron