Thanks very much for replying. I have "medium safety" checked on the java. Applets that I used to run, for example, streaming quotes on the site where I trade stocks, no longer work, and they did work before I did the downloads of JRE, JDK, so I have messed up something....
. I have installed those on my D drive and have made no changes to my path or classpath. Is that part of my problem?