I had something very similar happen when I installed the Mud Henry from Milviz. I ended up having to do a complete reinstall.
HOWEVER, after going good thru all of the steps, I realized that it might have been one of their .dlls loading through the exe.xml file. So you might want to delete/disable any suspect dlls loaded via the exe.xml file. Of course, don't consider this unless you're comfortable with the edit and you back it up.
Your mileage may vary.
Markeebo