Well, it seems Microsoft have been overstepping their marks again... this time by putting their own java applets into our windows service packs.
Apparently, the lawsuit between Microsoft and Java has resulted in Microsoft having to remove their java software from all service packs from now on, hence the release of service pack 1a. This means that the people with service packs prior to this are still gonna have an obsolete java applet on their system, even if they upgrade to 1a (as this doesn't remove the java you have from before). And the people that install from 1a with no prior installations aren't gonna have any java applet at all on their PC.
The latest supported Java engine must be installed to run the chat and games and etcetera of the future. (The proper Java engine being Sun Java technology). It won't run or install properly if MS JVM is still present on your machine. So...
How do people with Microsoft Java Virtual Machine embedded on their PCs get around this? Easy. I tried this simple step-by-step solution tonight, and have found no problems. Bear in mind that I have never messed with registry key deletions before, and this was my triumphant first attempt.
Do everything listed below, but I advise confidence as a computer user and some know-how is essential. Also, I cannot stress enough that XP users should CREATE A SYSTEM RESTORE POINT so that, if anything goes wrong, they can take their computer back to how it was before changes were made. Start >>> Programs >>> Accessories >>> System Tools >>> System Restore.
Now you've created a system restore point, click this link for the step-by-step guide:-
I also used windows' search files and folders option to locate some of these files for deletion. The one I was struggling to find was the java.PNF from the \%Systemroot%\inf folder... (%Systemroot% being the WINDOWS folder). I didn't see an INF folder on my system, so maybe the earlier deletions in the stages had automatically deleted the PNF file from the folder. Just a guess. But not finding this file hasn't made any difference.
When you have done all this, click on the link at the bottom of this webpage to download the Sun Java software. Once you have this, reboot your machine. Then go here for some basic system checks:-
Until a removal tool is released to do all this for you, and more people are made aware of this problem, I would make the above changes from MS JVM to Sun Java. For those of you who do not want to take the risk (as we're talking about registry key deletions here), then I would hang in there and see what happens about all this caboodle.
You screw up your registry... don't blame me. You saw my warnings!

~ Cuddle Cuffs.