I installed the plugin named Explorer (http://sourceforge.net/projects/npp-plugins/files/) yesterday, but then I could not open Notepad++. I closed the process, tried again, but nothing.
Then I went to Notepad++ folder, deleted the Explorer dll, and another related file in plugins folder. This was not easy even for me to detect the problem, so I can only imagine what it is doing to newbies in computers. You may be loosing a lot of users.