Can't open Java Control Panel, Can't unistall

Need help on this - I'm at a loss to figure it out.

Late last week something corrupted my Java ... maybe something I did but unforunately didn't notice the problem until later and can't remember what I might have been doing.

I noticed it when I went to a web site that I use that requires Java and it wasn't working. I tried to download the latest version and it wouldn't install. I went to Control Panel to open the Java Control Panel and just got a registry error message. Add/Remove Programs won't uninstall the old version either because it can't find a file. So I'm stuck ... can't uninstall and can't install.

I even tried System Restore and rolled back to a month ago and that didn't change anything. Here are some screen captures I've posted of the messages, etc. One message I didn't include in the screen captures is after clicking OK in the last shot (Windows Installer) I get the message "The installation source for this product is not available. Verify that the source exists and that you can access it." After which I have to cancel out.

I'm using Windows XP Professional.

Anyone have any suggestions?