Gone from the library or from your hard drive? Have you looked in the poser folder to see if it's there? Folders don't just up and delete themselves. Have you done a virus scan?

"It is good to see ourselves as others see us. Try as we may, we are never
able to know ourselves fully as we are, especially the evil side of us.
This we can do only if we are not angry with our critics but will take in good
heart whatever they might have to say." - Ghandi