Most of my fonts disappeared

Hi,

I didn't realize that my memory was full (I let my macbook air downloading overnight) and the computer got stuck. I logged out and back in and then deleted some stuff and now everything works fine. The problem is that some data was lost such as fonts (baskerville for example is in most of my pages documents and I can't use it anymore) and some preferences (the layout of the apps when I use the 5 fingers gesture).

Is there any way I can recover at least the lost fonts?

Thank you!