If you're unning Java 1.6, you may have to delete all other Java versions from your computer for it to work properly.

Have you tried JRE 1.5 update 10? You could give that a shot & see if things are any different.
http://java.sun.com/javase/downloads/index_jdk5.jsp

I'm not a Norton user, but you could also try reconfiguring Norton...
http://www.gnutellaforums.com/showpo...10&postcount=6