Lost endnote library without deleting anything

I have used Endnote for almost four years. I went to open the library two days ago and to my astonishment the library was nowhere to be found, how is this possible.

When going to recover the library the only files that I have in my endnote file are eni not enl. I have no idea how the library got deleted.
How do i recover the library, very frustrating after building a library for my dissertation over three years to lose it.