I can only think of two other things that may help you, other than saying how ME was thrown together because of y2k. Here's my first idea:
1. Find the Norton Antivirus folder. (should be something like C:\Program Files\Norton Antivirus)
2. Browse through the folder and look for an executable with an uninstallation name, such as uninstall, unwise, uninstaller, etc. When you find a file with a name similar or identical to those, double-click on it. That will initiate the uninstaller for Norton. Do the same to the other Norton products if there are other folders with Norton in it's name.
If you find the uninstaller executable, but it fails to start, I have another idea. But if you can't find it at all, I will have to find someone else to look at your problem.
Hope I helped