Yeah... you're going to need a clean install of Orbiter. There is way too much stuff going on right there to unpack.
Take a gander at something called the Jonesoft Mod Enabler tool. It's a very small program that goes in your Orbiter directory. When you first run it, it creates a folder (defaults to Mods) that you can stick all your addons into (unzipped, maintaining the directory structure).
From here (running the mod enabler) you select which mods/addons you want. It will migrate it over for you. Run Orbiter like normal, and the addon should be there for you.
When you are done, you can remove it (with a simple mouse click). If you find something that "breaks" your Orbiter installation, just remove it and delete the offending addon.