Resolved library missing from windows media player11

all my music and all my audio books are gone. help please

 

Did you have a look in My Documents > My Music

 

hawk22 yep looked there everywhere but the strange thing is that everything is back!!!!!open few minutes ago and there is a little spinning thingie with a little sign saying "one moment,please." and everything came back. i am so glad.
but i wish i knew what happened especially if it was something i did which i cant see cause the only thing that i did was download audio books from audible. really the only reason that i open the player was because parts of the books were'nt getting into the player,was just checking,sort of.
dont want it to ever happen again, but now i dont trust it,will it do it again? thanks for answering.